Alejandro Pozas-Kerstjens - Marvels and Mysteries in network nonlocality. A journey to the smallest (and simplest) demonstration of quantum nonlocality in networks

Wed, 11 Feb 2026 00:00:00 +0000

Marvels and Mysteries in network nonlocality. A journey to the smallest (and simplest) demonstration of quantum nonlocality in networks

This seminar, given by Alejandro Pozas-Kerstjens, will happend on 11 February 2026, at 13:0. It will take place in Room 26-00/534.

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Abstract

After many decades of studying quantum nonlocality in bipartite and trivial multipartite scenarios, the field is now showing interest in networks where multiple independent sources distribute physical systems to different sets of parties. The study of nonlocality in networks is resulting very fruitful, with many interesting results, especially at the foundational level. Yet, the need to take into account the independence of the sources makes understanding network correlations difficult in general. In this talk, I will exemplify this difficulty by trying to answer the question what is the simplest demonstration of quantum nonlocality in networks?. This will take us through a journey that begins at the very start of the field in 2012 and ends by demonstrating that quantum nonlocality in the triangle network without inputs and with binary outcomes is possible. This demonstration refutes an 8-year-old conjecture in the field, and I will argue that it constitutes a demonstration of nonlocality that, in a sense, is simpler than the traditional demonstration in the bipartite case. This talk is based on arXiv:2305.03745, arXiv:2503.16654, and upcoming, unpublished work.

Alejandro Pozas-Kerstjens | LIP6 - QI Team

Alejandro Pozas-Kerstjens - Marvels and Mysteries in network nonlocality. A journey to the smallest (and simplest) demonstration of quantum nonlocality in networks

Marvels and Mysteries in network nonlocality. A journey to the smallest (and simplest) demonstration of quantum nonlocality in networks

Abstract