Demonstration of Quantum Nonlocality in presence of Measurement Dependence

Abstract

Quantum nonlocality stands as a resource for Device Independent Quantum Information Processing (DIQIP), as, for instance, Device Independent Quantum Key Distribution. We investigate experimentally the assumption of limited Measurement Dependence, i.e., that the measurement settings used in Bell inequality tests or DIQIP are partially influenced by the source of entangled particle and/or by an adversary. Using a recently derived Bell-like inequality [Phys. Rev. Lett. 113 190402] and a 99% fidelity source of partially entangled polarization photonic qubits, we obtain a clear violation of the inequality, excluding a much larger range of measurement dependent local models than would be possible with an adapted Clauser, Horne, Shimony and Holt (CHSH) inequality. It is therefore shown that the Measurement Independence assumption can be widely relaxed while still demonstrating quantum nonlocality.

References in corpus (4)

• Device-independent quantum key distribution secure against collective attacks
• Relaxed Bell inequalities and Kochen-Specker theorems
• A high-brightness source of polarization-entangled photons optimized for applications in free space
• The effects of reduced "free will" on Bell-based randomness expansion

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• Causal Networks and Freedom of Choice in Bell's Theorem
• Bell vs Bell: a ding-dong battle over quantum incompleteness
• Optimal and robust error filtration for quantum information processing