Publications

Demonstration of a quantum SWITCH in a Sagnac configuration
The quantum SWITCH is an example of a process with an indefinite causal structure, and has attracted attention for its ability to …
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Encryption with Quantum Public Keys
It is an important question to find constructions of quantum cryptographic protocols which rely on weaker computational assumptions …
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CV-QKD Receiver Platform Based On A Silicon Photonic Integrated Circuit
We report on the characterization of a SiGe PIC-based receiver along with its usage in a Gaussian-modulated coherent state CV-QKD …
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Linear optical logical Bell state measurements with optimal loss-tolerance threshold
Quantum threshold theorems impose hard limits on the hardware capabilities to process quantum information. We derive tight and …
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Inflated Graph States Refuting Communication-Assisted LHV Models
Standard Bell inequalities hold when distant parties are not allowed to communicate. Barrett et al. found correlations from Pauli …
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Photonic Resources for the Implementation of Quantum Network Protocols
The security of modern communication networks can be enhanced thanks to the laws of quantum mechanics. In this thesis, we develop a …
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Classically Approximating Variational Quantum Machine Learning with Random Fourier Features
Many applications of quantum computing in the near term rely on variational quantum circuits (VQCs). They have been showcased as a …
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Quantum Lock: A Provable Quantum Communication Advantage
Physical unclonable functions(PUFs) provide a unique fingerprint to a physical entity by exploiting the inherent physical randomness. …
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Unifying Quantum Verification and Error-Detection: Theory and Tools for Optimisations
With the recent availability of cloud quantum computing services, the question of verifying quantum computations delegated by a client …
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Experimental superposition of time directions
In the macroscopic world, time is intrinsically asymmetric, flowing in a specific direction, from past to future. However, the same is …
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Experimental cheat-sensitive quantum weak coin flipping
As in modern communication networks, the security of quantum networks will rely on complex cryptographic tasks that are based on a …
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Differential Privacy Amplification in Quantum and Quantum-inspired Algorithms
Differential privacy provides a theoretical framework for processing a dataset about n users, in a way that the output reveals a …
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CV-QKD Receiver Platform Based On A Silicon Photonic Chip
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Quantum City: simulation of a practical near-term metropolitan quantum network
We present the architecture and analyze the applications of a metropolitan-scale quantum network that requires only limited hardware …
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QEnclave - A practical solution for secure quantum cloud computing
We introduce a secure hardware device named a QEnclave that can secure the remote execution of quantum operations while only using …
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Quantum security of subset cover problems
The subset cover problem for $k \geq 1$ hash functions, which can be seen as an extension of the collision problem, was introduced in …
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Post-Quantum Zero-Knowledge with Space-Bounded Simulation
The traditional definition of quantum zero-knowledge stipulates that the knowledge gained by any quantum polynomial-time verifier in an …
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A Versatile PIC-based CV-QKD receiver
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Quantum nonlocality in presence of strong measurement dependence
It is well known that the effect of quantum nonlocality, as witnessed by violation of a Bell inequality, can be observed even when …
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A Linear Algebraic Framework for Quantum Internet Dynamic Scheduling
Future quantum internet aims to enable quantum communication between arbitrary pairs of distant nodes through the sharing of end-to-end …
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Long-range QKD without trusted nodes is not possible with current technology
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ParisRegionQCI: A Parisian Quantum Network
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A Versatile PIC-based CV-QKD Receiver
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Semi-device-independent Certification of Causal Nonseparability with Trusted Quantum Inputs
While the standard formulation of quantum theory assumes a fixed background causal structure, one can relax this assumption within the …
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Quantum Local Differential Privacy and Quantum Statistical Query Model
The problem of private learning has been extensively studied in classical computer science. Notably, a striking equivalence between …
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Private network parameter estimation with quantum sensors
Networks of quantum sensors are a central application of burgeoning quantum networks. A key question for the use of such networks will …
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Experimental Demonstration of Discrete Modulation Formats for Continuous Variable Quantum Key Distribution
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A Versatile CV-QKD system with a PIC-based receiver
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A Linear Algebraic Framework for Quantum Internet Dynamic Scheduling
Future quantum internet aims to enable quantum communication between arbitrary pairs of distant nodes through the sharing of end-to-end …
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On the connection between quantum pseudorandomness and quantum hardware assumptions
This paper, for the first time, addresses the questions related to the connections between quantum pseudorandomness and quantum …
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Complete ZX-calculi for the stabiliser fragment in odd prime dimensions
We introduce a family of ZX-calculi which axiomatise the stabiliser fragment of quantum theory in odd prime dimensions. These calculi …
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Bridging the gap between technology and policy in GDPR compliance: the role of differential privacy
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Self-testing nonlocality without entanglement
Quantum theory allows for nonlocality without entanglement. Notably, there exist bipartite quantum measurements consisting of only …
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Study of Protocols Between Classical Clients and a Quantum Server
Quantum computers promise surprising powers of computation by exploiting the stunning physical properties of infinitesimally small …
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Quantum Optics Systems for Long-Distance Cryptography and Quantum Networks
The thesis is divided into two parts: The first part is in the field of Quantum Cryptography. In this part we develop a theoretical …
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Advanced signal processing techniques for continuous variable quantum key distribution over optical fiber.
Quantum key distribution offers the possibility of cryptography whose security is demonstrated by the laws of quantum physics. The …
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Advanced signal processing techniques for continuous variable quantum key distribution over optical fiber
Quantum key distribution offers the possibility of cryptography whose security is demonstrated by the laws of quantum physics. The …
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Qualifying quantum approaches for hard industrial optimization problems. A case study in the field of smart-charging of electric vehicles
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Satellite-based Quantum Information Networks: Use cases, Architecture, and Roadmap
Quantum Information Networks (QIN) currently represent a major goal in the field quantum communication technologies. Such QINs will …
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Measurement-based quantum computation beyond qubits
Measurement-based quantum computation (MBQC) is an alternative model for quantum computation, which makes careful use of the properties …
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Quantum learning algorithms imply circuit lower bounds
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Sample-efficient device-independent quantum state verification and certification
Authentication of quantum sources is a crucial task in building reliable and efficient protocols for quantum-information processing. …
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2022 Roadmap on integrated quantum photonics
Abstract Integrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of …
Galan Moody, Volker Sorger, Daniel Blumenthal, Paul Juodawlkis, William Loh, Cheryl Sorace-Agaskar, Alex Jones, Krishna Balram, Jonathan Matthews, Anthony Laing, Marcelo Davanco, Lin Chang, John Bowers, Niels Quack, Christophe Galland, Igor Aharonovich, Martin Wolff, Carsten Schuck, Neil Sinclair, Marko Lončar, Tin Komljenovic, David Weld, Shayan Mookherjea, Sonia Buckley, Marina Radulaski, Stephan Reitzenstein, Benjamin Pingault, Bartholomeus Machielse, Debsuvra Mukhopadhyay, Alexey Akimov, Aleksei Zheltikov, Girish Agarwal, Kartik Srinivasan, Juanjuan Lu, Hong Tang, Wentao Jiang, Timothy Mckenna, Amir Safavi-Naeini, Stephan Steinhauer, Ali Elshaari, Val Zwiller, Paul Davids, Nicholas Martinez, Michael Gehl, John Chiaverini, Karan Mehta, Jacquiline Romero, Navin Lingaraju, Andrew Weiner, Daniel Peace, Robert Cernansky, Mirko Lobino, Eleni Diamanti, Luis Trigo Vidarte, Ryan Camacho
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Contextuality and Wigner negativity are equivalent for continuous-variable quantum measurements
Quantum computers will provide considerable speedups with respect to their classical counterparts. However, the identification of the …
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Quantum Metrology with Delegated Tasks
A quantum metrology scheme can be decomposed into three quantum tasks: state preparation, parameter encoding and measurements. …
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Probably approximately correct quantum source coding
Information-theoretic lower bounds are often encountered in several branches of computer science, including learning theory and …
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Quantum Information Techniques for Quantum Metrology
Quantum metrology is an auspicious discipline of quantum information which is currently witnessing a surge of experimental …
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Detecting a target with quantum entanglement
In the last decade a lot of research activity focused on the use of quantum entanglement as a resource for remote target detection, …
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Multipartite communications over quantum networks
The field of quantum networks is currently a major area of investigation in quantum technologies. One of the simplest acts of quantum …
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Tight adaptive reprogramming in the QROM
The random oracle model (ROM) enjoys widespread popularity, mostly because it tends to allow for tight and conceptually simple proofs …
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Cost and Routing of Continuous Variable Quantum Networks
We study continuous-variable graph states as quantum communication networks. We explore graphs with regular and complex network shapes …
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Classical-quantum network coding: a story about tensor
We study here the conditions to perform the distribution of a pure state on a quantum network using quantum operations which can …
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Randomized Benchmarking with Stabilizer Verification and Gate Synthesis
Recently, there has been an emergence of useful applications for noisy intermediate-scale quantum (NISQ) devices notably, though not …
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Non-Destructive Zero-Knowledge Proofs on Quantum States, and Multi-Party Generation of Authorized Hidden GHZ States
Due to the special no-cloning principle, quantum states appear to be very useful in cryptography. But this very same property also has …
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Mitigating errors by quantum verification and post-selection
Correcting errors due to noise in quantum circuits run on current and near-term quantum hardware is essential for any convincing …
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Efficient Construction of Quantum Physical Unclonable Functions with Unitary t-designs
Quantum physical unclonable functions, or QPUFs, are rapidly emerging as theoretical hardware solutions to provide secure cryptographic …
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A Unified Framework For Quantum Unforgeability
In this paper, we continue the line of work initiated by Boneh and Zhandry at CRYPTO 2013 and EUROCRYPT 2013 in which they formally …
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Verification of graph states in an untrusted network
Graph states are a large class of multipartite entangled quantum states that form the basis of schemes for quantum computation, …
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Graph neural network initialisation of quantum approximate optimisation
Approximate combinatorial optimisation has emerged as one of the most promising application areas for quantum computers, particularly …
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Analysis of satellite-to-ground quantum key distribution with adaptive optics
Future quantum communication infrastructures will rely on both terrestrial and space-based links integrating high-performance optical …
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Efficient verification of Boson Sampling
The demonstration of quantum speedup, also known as quantum computational supremacy, that is the ability of quantum computers to …
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QEnclave -- A practical solution for secure quantum cloud computing
We introduce a secure hardware device named a QEnclave that can secure the remote execution of quantum operations while only using …
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Hybrid PUF: A Novel Way to Enhance the Security of Classical PUFs
Physical unclonable functions provide a unique ‘fingerprint’ to a physical entity by exploiting the inherent physical …
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A versatile and high-performance PIC-based CV-QKD receiver
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The Interplay between Quantum Contextuality and Wigner Negativity
The use of quantum information in technology promises to supersede the so-called classical devices used nowadays. Understanding what …
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The interplay between quantum contextuality and Wigner negativity
Quantum physics has revolutionised our way of conceiving nature and is now bringing about a new technological revolution. The use of …
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Network Quantum Steering
The development of large-scale quantum networks promises to bring a multitude of technological applications as well as shed light on …
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Oblivious Transfer is in MiniQCrypt
MiniQCrypt is a world where quantum-secure one-way functions exist, and quantum communication is possible. We construct an oblivious …
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Outcome determinism in measurement-based quantum computation with qudits
In measurement-based quantum computing (MBQC), computation is carried out by a sequence of measurements and corrections on an entangled …
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High-Rate Continuous Variable Quantum Key Distribution Based on Probabilistically Shaped 64 and 256-QAM
We designed a CV-QKD system with off-the-shelf components and established the feasibility of distributing 67.6 and 66.8 Mb/s secret key …
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Device-Independent Quantification of Quantum Resources
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Semi-device-independent Certification of Causal Nonseparability with Trusted Quantum Inputs
While the standard formulation of quantum theory assumes a fixed background causal structure, one can relax this assumption within the …
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Flexible entanglement-distribution network with an AlGaAs chip for secure communications
Abstract Quantum communication networks enable applications ranging from highly secure communication to clock synchronization and …
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Multi-Party Quantum Cryptography : from Folklore to Real-World
Quantum cryptography builds upon decades of advances both in classical cryptography and networks. However, contrary to its classical …
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Classical simulation of Gaussian quantum circuits with non-Gaussian input states
We consider Gaussian quantum circuits supplemented with non-Gaussian input states and derive sufficient conditions for efficient …
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Quantum machine learning with adaptive linear optics
We study supervised learning algorithms in which a quantum device is used to perform a computational subroutine - either for prediction …
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Quantum technologies in space
Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of …
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Experimental Approach to Demonstrating Contextuality for Qudits
We propose a method to experimentally demonstrate contextuality with a family of tests for qudits. The experiment we propose uses a …
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Certifying dimension of quantum systems by sequential projective measurements
This work analyzes correlations arising from quantum systems subject to sequential projective measurements to certify that the system …
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Witnessing Wigner Negativity
Negativity of the Wigner function is arguably one of the most striking non-classical features of quantum states. Beyond its fundamental …
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Demonstration of Probabilistic Constellation Shaping for Continuous Variable Quantum Key Distribution
We demonstrate, for the first time to our knowledge, continuous-variable quantum key distribution using probabilistically-shaped …
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Certification of Non-Gaussian States with Operational Measurements
We derive a theoretical framework for the experimental certification of non-Gaussian features of quantum states using double homodyne …
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Composable Security for Multipartite Entanglement Verification
We present a composably secure protocol allowing $n$ parties to test an entanglement generation resource controlled by a possibly …
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Flow conditions for continuous variable measurement-based quantum computing
In measurement-based quantum computing (MBQC), computation is carried out by a sequence of measurements and corrections on an entangled …
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Practical Limits of Error Correction for Quantum Metrology
Noise is the greatest obstacle in quantum metrology that limits it achievable precision and sensitivity. There are many techniques to …
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Continuous variable multimode quantum states via symmetric group velocity matching
Configurable and scalable continuous variable quantum networks for measurement-based quantum information protocols or multipartite …
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Delegating Multi-Party Quantum Computations vs. Dishonest Majority in Two Quantum Rounds
Multi-Party Quantum Computation (MPQC) has attracted a lot of attention as a potential killer-app for quantum networks through …
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Continuous-variable quantum cryptographic protocols
This thesis is concerned with the study and analysis of two quantum cryptographic protocols: quantum key distribution (QKD) and …
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Experimental demonstration of quantum advantage for NP verification with limited information
In recent years, many computational tasks have been proposed as candidates for showing a quantum computational advantage, that is an …
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Error-correcting entanglement swapping using a practical logical photon encoding
The implementation of a quantum internet requires the distribution of entanglement over long distances, which is facilitated by …
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The Quantum Cut-and-Choose Technique and Quantum Two-Party Computation
The application and analysis of the Cut-and-Choose technique in protocols secure against quantum adversaries is not a straightforward …
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On-State Commutativity of Measurements and Joint Distributions of Their Outcomes
In this note, we analyze joint probability distributions that come from the outcomes of quantum measurements performed on sets of …
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Two combinatorial MA-complete problems
Despite the interest in the complexity class MA, the randomized analog of NP, just a few natural MA-complete problems are known. The …
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Variational Quantum Cloning: Improving Practicality for Quantum Cryptanalysis
Cryptanalysis on standard quantum cryptographic systems generally involves finding optimal adversarial attack strategies on the …
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Secure Quantum Two-Party Computation: Impossibility and Constructions
Secure two-party computation considers the problem of two parties computing a joint function of their private inputs without revealing …
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Qualifying quantum approaches for hard industrial optimization problems. A case study in the field of smart-charging of electric vehicles
In order to qualify quantum algorithms for industrial NP-Hard problems, comparing them to available polynomial approximate classical …
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Client-Server Identification Protocols with Quantum PUF
Recently, major progress has been made towards the realisation of the quantum internet to enable a broad range of applications that …
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A Continuous Variable Born Machine
Generative Modelling has become a promising use case for near term quantum computers. In particular, due to the fundamentally …
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Feasibility of satellite-to-ground continuous-variable quantum key distribution
Establishing secure communication links at a global scale is a major potential application of quantum information science but also …
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Quantum Technology for Economists
Research on quantum technology spans multiple disciplines: physics, computer science, engineering, and mathematics. The objective of …
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Quantum versus Classical Generative Modelling in Finance
Finding a concrete use case for quantum computers in the near term is still an open question, with machine learning typically touted as …
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Security Limitations of Classical-Client Delegated Quantum Computing
Secure delegated quantum computing allows a computationally weak client to outsource an arbitrary quantum computation to an untrusted …
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Quantum statistical query learning
We propose a learning model called the quantum statistical learning QSQ model, which extends the SQ learning model introduced by Kearns …
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Quantum learning algorithms imply circuit lower bounds
We establish the first general connection between the design of quantum algorithms and circuit lower bounds. Specifically, let …
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Dispelling Myths on Superposition Attacks: Formal Security Model and Attack Analyses
It is of folkloric belief that the security of classical cryptographic protocols is automatically broken if the Adversary is allowed to …
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Quantum Advantage in Information Retrieval
Random access codes have provided many examples of quantum advantage in communication, but concern only one kind of information …
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Securing Quantum Computations in the NISQ Era
Recent experimental achievements motivate an ever-growing interest from companies starting to feel the limitations of classical …
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QMA-Hardness of Consistency of Local Density Matrices with Applications to Quantum Zero-Knowledge
We provide several advances to the understanding of the class of Quantum Merlin-Arthur proof systems (QMA), the quantum analogue of NP. …
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Non-interactive classical verification of quantum computation
In a recent breakthrough, Mahadev constructed an interactive protocol that enables a purely classical party to delegate any quantum …
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StoqMA vs. MA: the power of error reduction
StoqMA characterizes the computational hardness of stoquastic local Hamiltonians, which is a family of Hamiltonians that does not …
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Authenticated teleportation and verification in a noisy network
Authenticated teleportation aims to certify the transmission of a quantum state through teleportation, even in the presence of an …
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Photonic orbital angular momentum in turbulence: vortex splitting and adaptive optics
Recent works revealed that transmission of light beams carrying orbital-angular-momentum (OAM) through turbulence causes the optical …
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Fault-tolerant quantum speedup from constant depth quantum circuits
A defining feature in the field of quantum computing is the potential of a quantum device to outperform its classical counterpart for a …
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Quantum weak coin flipping with a single photon
Weak coin flipping is among the fundamental cryptographic primitives which ensure the security of modern communication networks. It …
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Rates of Multipartite Entanglement Transformations
The theory of the asymptotic manipulation of pure bipartite quantum systems can be considered completely understood: the rates at which …
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Breaking simple quantum position verification protocols with little entanglement
Instantaneous nonlocal quantum computation (INQC) evades apparent quantum and relativistic constraints and allows to attack generic …
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Continuous Variable Quantum Advantages and Applications in Quantum Optics
Quantum physics has led to a revolution in our conception of the nature of our world and is now bringing about a technological …
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Continuous variable quantum advantages and applications in quantum optics
Quantum physics has led to a revolution in our conception of the nature of our world and is now bringing about a technological …
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The Born supremacy: quantum advantage and training of an Ising Born machine
The search for an application of near-term quantum devices is widespread. Quantum machine learning is touted as a potential utilisation …
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Quantum certification and benchmarking
Concomitant with the rapid development of quantum technologies, challenging demands arise concerning the certification and …
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Graph States as a Resource for Quantum Metrology
By using highly entangled states, quantum metrology guarantees precision impossible with classical measurements. Unfortunately such …
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Stellar representation of non-Gaussian quantum states
The so-called stellar formalism allows to represent the non-Gaussian properties of single-mode quantum states by the distribution of …
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A simple protocol for certifying graph states and applications in quantum networks
We present a simple protocol for certifying graph states in quantum networks using stabiliser measurements. The certification …
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Design and implementation of high-performance devices for continuous-variable quantum key distribution
Quantum key distribution (QKD) is one of the first quantum technologies that were able to provide commercially meaningful solutions to …
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Quantum Physical Unclonable Functions: Possibilities and Impossibilities
Physical Unclonable Functions (PUFs) are physical devices with unique behavior that are hard to clone. A variety of PUF schemes have …
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QFactory: classically-instructed remote secret qubits preparation
The functionality of classically-instructed remotely prepared random secret qubits was introduced in (Cojocaru et al 2018) as a way to …
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Robust quantum metrology with explicit symmetric states
Quantum metrology is a promising practical use case for quantum technologies, where physical quantities can be measured with …
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Distributing Graph States Over Arbitrary Quantum Networks
Multipartite entangled states are great resources for quantum networks. In this work we study the distribution, or routing, of …
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Randomness for quantum information processing
This thesis is focused on the generation and understanding of particular kinds of quantum randomness. Randomness is useful for many …
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Unitary $t$-designs from $relaxed$ seeds
In this work we reduce the requirements for generating $t$-designs, an important tool for randomisation with applications across …
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Methods for Classically Simulating Noisy Networked Quantum Architectures
As research on building scalable quantum computers advances, it is important to be able to certify their correctness. Due to the …
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On the permanent of Sylvester-Hadamard matrices
We prove a conjecture due to Wanless about the permanent of Hadamard matrices in the particular case of Sylvester-Hadamard matrices. …
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Authenticated teleportation with one-sided trust
We introduce a protocol for authenticated teleportation, which can be proven secure even when the receiver does not trust their …
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Fast Quantum Algorithm for Solving Multivariate Quadratic Equations
In August 2015 the cryptographic world was shaken by a sudden and surprising announcement by the US National Security Agency NSA …
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Random coding for sharing bosonic quantum secrets
We consider a protocol for sharing quantum states using continuous variable systems. Specifically we introduce an encoding procedure …
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Complexity-theoretic limitations on blind delegated quantum computation
Blind delegation protocols allow a client to delegate a computation to a server so that the server learns nothing about the input to …
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The Born Supremacy: Quantum Advantage and Training of an Ising Born Machine
The search for an application of near-term quantum devices is widespread. Quantum Machine Learning is touted as a potential utilisation …
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Asymptotic security of continuous-variable quantum key distribution with a discrete modulation
We establish a lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with a discrete modulation …
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Continuous-variable nonlocality and contextuality
Contextuality is a non-classical behaviour that can be exhibited by quantum systems. It is increasingly studied for its relationship to …
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Anonymity for Practical Quantum Networks
Quantum communication networks have the potential to revolutionize information and communication technologies. Here we are interested …
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Efficient approximate unitary t-designs from partially invertible universal sets and their application to quantum speedup
At its core a $t$-design is a method for sampling from a set of unitaries in a way which mimics sampling randomly from the Haar measure …
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Semi-device-independent quantum money with coherent states
The no-cloning property of quantum mechanics allows unforgeability of quantum banknotes and credit cards. Quantum credit card protocols …
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Probabilistic Fault-Tolerant Universal Quantum Computation and Sampling Problems in Continuous Variables
Continuous-Variable (CV) devices are a promising platform for demonstrating large-scale quantum information protocols. In this …
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Optimal quantum-programmable projective measurement with linear optics
We present a scheme for a universal device which can be programed by quantum states to approximate a chosen projective measurement to a …
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A simple protocol for fault tolerant verification of quantum computation
With experimental quantum computing technologies now in their infancy, the search for efficient means of testing the correctness of …
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Quantum superiority for verifying NP-complete problems with linear optics
Demonstrating quantum superiority for some computational task will be a milestone for quantum technologies and would show that …
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Demonstration of Einstein-Podolsky-Rosen Steering Using Hybrid Continuous- and Discrete-Variable Entanglement of Light
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Engineering four-wave mixing spectral entanglement in hollow-core fibers
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On the possibility of classical client blind quantum computing
We define the functionality of delegated pseudo-secret random qubit generator (PSRQG), where a classical client can instruct the …
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A Comprehensive Analysis of Quantum E-voting Protocols
Recent advances at Google, IBM, as well as a number of research groups indicate that quantum computers will soon be reality. Motivated …
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Utilisation de fibres à couplage inhibé pour le controle de l'intrication spectrale de paires de photons
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One-Sided Device-Independent Certification of Unbounded Random Numbers
The intrinsic non-locality of correlations in Quantum Mechanics allow us to certify the behaviour of a quantum mechanism in a device …
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Space QUEST mission proposal: Experimentally testing decoherence due to gravity
Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that …
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Shaping photon-pair time-frequency correlations in inhibited-coupling hollow-core fibers
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Shaping photon-pairs time-frequency correlations in inhibited-coupling hollow-core fibers
We experimentally show how multiband dispersion properties of inhibited-coupling hollow-core fibers allow to control the spectral …
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Theoretical and practical aspects of verification of quantum computers
Quantum computing is emerging at a meteoric pace from a pure academic field to a fully industrial framework. Rapid advances are …
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Experimental detection of steerability in Bell local states with two measurement settings
Steering, a quantum property stronger than entanglement but weaker than non-locality in the quantum correlation hierarchy, is a key …
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Information Theoretically Secure Hypothesis Test for Temporally Unstructured Quantum Computation (Extended Abstract)
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Classical multiparty computation using quantum resources
In this work, we demonstrate a way to perform classical multiparty computing among parties with limited computational resources. Our …
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Multiparty Delegated Quantum Computing
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Unconditionally verifiable blind quantum computation
Blind quantum computing (BQC) allows a client to have a server carry out a quantum computation for them such that the client’s …
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Verification of Quantum Computation and the Price of Trust
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Garbled Quantum Computation
The universal blind quantum computation protocol (UBQC) enables an almost classical client to delegate a quantum computation to an …
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Optimised resource construction for verifiable quantum computation
Recent developments have brought the possibility of achieving scalable quantum networks and quantum devices closer. From the …
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Rigidity of quantum steering and one-sided device-independent verifiable quantum computation
The relationship between correlations and entanglement has played a major role in understanding quantum theory since the work of …
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Best of both worlds
Secure communication is emerging as a significant challenge for our hyper-connected data-dependent society. The answer may lie in a …
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Violating Bell inequalities with entangled optical frequency combs and multi-pixel homodyne detection
We have theoretically investigated the possibility of using any of several continuous-variable Bell-type inequalities - for which the …
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Verifying BQP Computations on Noisy Devices with Minimal Overhead
With the development of delegated quantum computation, clients will want to ensure confidentiality of their data and algorithms, and …
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Verification of Quantum Computation: An Overview of Existing Approaches
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Tsirelson's bound and Landauer's principle in a single-system game
We introduce a simple single-system game inspired by the Clauser-Horne-Shimony-Holt (CHSH) game. For qubit systems subjected to unitary …
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Super- and subradiance of clock atoms in multimode optical waveguides
The transversely confined propagating modes of an optical fiber mediate virtually infinite range energy exchanges among atoms placed …
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Quantum Protocol for Electronic Voting without Election Authorities
Electronic voting is a very useful but challenging internet-based protocol that despite many theoretical approaches and various …
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Quantum Advantage from Sequential-Transformation Contextuality
We introduce a notion of contextuality for transformations in sequential contexts, distinct from the Bell-Kochen-Specker and Spekkens …
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QMA-Hardness of Consistency of Local Density Matrices with Applications to Quantum Zero-Knowledge
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Optimal quantum-programmable projective measurements with coherent states
We consider a device which can be programed using coherent states of light to approximate a given projective measurement on an input …
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Multiphoton and Side-Channel Attacks in Mistrustful Quantum Cryptography
Mistrustful cryptography includes important tasks like bit commitment, oblivious transfer, coin flipping, secure computations, position …
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Mode-selective single-photon addition to a multimode quantum field
Spectro-temporal modes of light can be exploited for the generation of high-dimensional Gaussian quantum states. Such states are at the …
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Genuine network quantum nonlocality and self-testing
The network structure offers in principle the possibility for novel forms of quantum nonlocal correlations, that are proper to networks …
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Generation of quantum states of light in nonlinear AlGaAs chips: engineering and applications
Photonic quantum technologies represent a promising platform for applications ranging from long-distance secure communications to the …
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Full characterization of the transmission properties of a multi-plane light converter
Multi-plane light conversion allows to perform arbitrary transformations on a finite set of spatial modes with no theoretical …
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Experimental investigation of practical unforgeable quantum money
Wiesner’s unforgeable quantum money scheme is widely celebrated as the first quantum information application. Based on the …
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Experimental demonstration of quantum advantage for one-way communication complexity surpassing best-known classical protocol
Demonstrating a quantum advantage with currently available experimental systems is of utmost importance in quantum information science. …
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Entanglement of truncated quantum states
We investigate the impact of Hilbert-space truncation upon the entanglement of an initially maximally entangled m × m bipartite quantum …
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Dispelling myths on superposition attacks: formal security model and attack analyses
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Cyber security in the quantum era
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Cryptographic approach to Quantum Metrology
We consider a cryptographically motivated framework for quantum metrology in the presence of a malicious adversary. We begin by …
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Composable security of two-way continuous-variable quantum key distribution without active symmetrization
We present a general framework encompassing a number of continuous-variable quantum key distribution protocols, including standard …
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Certified Randomness From Steering Using Sequential Measurements
The generation of certifiable randomness is one of the most promising applications of quantum technologies. Furthermore, the intrinsic …
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Building trust for continuous variable quantum states
We first introduce heterodyne quantum state tomography, a reliable method for continuous variable quantum state certification which …
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Benchmarking of quantum protocols
Quantum network protocols offer new functionalities such as enhanced security to communication and computational systems. Despite the …
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Active engineering of four-wave mixing spectral correlations in multiband hollow-core fibers
We demonstrate theoretically and experimentally a high level of control of the four-wave mixing process in an inert gas–filled …
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A step closer to secure global communication
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