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Abstract: Nonlocality lies at the core of quantum mechanics from both a fundamental andapplicative point of view. It is typically revealed by a Bell test, that is byviolation of a Bell inequality, whose success depends both on the state of thesystem and on parameters linked to experimental settings. This leads to find,given the state, optimized parameters for a successful test. Here we provide,for a quite general class of quantum states, the explicit expressions of theseoptimized parameters and point out that, for a continuous change of the state,the corresponding suitable experimental settings may unexpectedly varydiscontinuously. We finally show in a paradigmatic open quantum system thatthis abrupt -jump- of the experimental settings may even occur during the timeevolution of the system. These jumps must be taken into account in order not tocompromise the correct detection of nonlocality in the system.



Autor: Bruno Bellomo, Rosario Lo Franco, Giuseppe Compagno

Fuente: https://arxiv.org/



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