Scientific article
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Bilocal Bell inequalities violated by the quantum Elegant Joint Measurement

Published inPhysical review letters, vol. 126, no. 22, 220401
Publication date2021-06-01
First online date2021-06-01

Network Bell experiments give rise to a form of quantum nonlocality that conceptually goes beyond Bell's theorem. We investigate here the simplest network, known as the bilocality scenario. We depart from the typical use of the Bell State Measurement in the network central node and instead introduce a family of symmetric iso-entangled measurement bases that generalise the so-called Elegant Joint Measurement. This leads us to report noise-tolerant quantum correlations that elude bilocal variable models. Inspired by these quantum correlations, we introduce network Bell inequalities for the bilocality scenario and show that they admit noise-tolerant quantum violations. In contrast to many previous studies of network Bell inequalities, neither our inequalities nor their quantum violations are based on standard Bell inequalities and standard quantum nonlocality. Moreover, we pave the way for an experimental realisation by presenting a simple two-qubit quantum circuit for the implementation of the Elegant Joint Measurement and our generalisation.

  • General Physics: Statistical and Quantum Mechanics
  • Quantum Information
Citation (ISO format)
TAVAKOLI, Armin, GISIN, Nicolas, BRANCIARD, Cyril. Bilocal Bell inequalities violated by the quantum Elegant Joint Measurement. In: Physical review letters, 2021, vol. 126, n° 22, p. 220401. doi: 10.1103/PhysRevLett.126.220401
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Article (Submitted version)
ISSN of the journal0031-9007

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