Optimized experimental settings for the best detection of quantum nonlocality

Abstract

Nonlocality lies at the core of quantum mechanics from both a fundamental and applicative point of view. It is typically revealed by a Bell test, that is by violation of a Bell inequality, whose success depends both on the state of the system 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 these optimized parameters and point out that, for a continuous change of the state, the corresponding suitable experimental settings may unexpectedly vary discontinuously. We finally show in a paradigmatic open quantum system that this abrupt "jump" of the experimental settings may even occur during the time evolution of the system. These jumps must be taken into account in order not to compromise the correct detection of nonlocality in the system.

5 pages, 2 figures

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Cited by in corpus (8)

• Dynamics of quantum correlations in two-qubit systems within non-Markovian environments
• Preserving entanglement and nonlocality in solid-state qubits by dynamical decoupling
• Entanglement estimation from Bell inequality violation
• Spin-echo entanglement protection from random telegraph noise
• Multipartite Nonlocality as a Resource and Quantum Correlations Having Indefinite Causal Order
• Dynamics of Atom-Atom Correlations in the Fermi problem
• Non-Markovianity and Clauser-Horne-Shimony-Holt (CHSH)-Bell inequality violation in quantum dissipative systems
• Nonlocality threshold for entanglement under general dephasing evolutions: A case study