Consequences of the single-pair measurement of the Bell parameter

Abstract

Bell inequalities represent a milestone for contemporary Physics, both for quantum foundations investigation and technological applications (e.g., quantum communication and entanglement certification). Although loophole-free tests have been recently performed, a strong debate is still ongoing on the actual meaning of Bell inequality tests, for example on the possible additional hypotheses (end eventual loopholes) to be included in Bell's theorem, as well as on the implications for certain interpretations of quantum mechanics. A recent work [S. Virzì et al., Quantum Sci. Technol. 9, 045027 (2024)] challenges some of the statements appeared in this debate, achieving for the first time an experimental estimation of the entire Bell-CHSH parameter from a single entangled pair thanks to a weak-interaction-based measurement approach. Here we analyse the implications of this result for quantum mechanics foundations investigation, illustrating how it can tackle some of the aforementioned interpretations of Bell inequality tests and, more in general, of quantum mechanics itself.

References in corpus (17)

• Research on Hidden Variable Theories: a review of recent progresses
• Weak values and the Leggett-Garg inequality in solid-state qubits
• Sequential weak measurement
• Single-photon nonlocality in quantum networks
• Anomalous Weak Values and the Violation of a Multiple-measurement Leggett-Garg Inequality
• Does quantum mechanics tell an atomistic spacetime?
• Path Integral Approach to 't Hooft's Derivation of Quantum from Classical Physics
• Experimental full network nonlocality with independent sources and strict locality constraints
• Single-pair measurement of the Bell parameter
• Experimental demonstration of genuine tripartite nonlocality under strict locality conditions
• Quantum Nonlocality: how does Nature do it?
• Nonlocality activation in a photonic quantum network
• Can quantum non-locality be connected to extra-dimensions?
• Experimental Test of Nonlocality Limits from Relativistic Independence
• Quantum Correlation Bounds for Quantum Information Experiments Optimization: the Wigner Inequality Case
• Experimental investigation of the relation between measurement uncertainties and non-local quantum correlations
• Single-measurement Bell analysis

Cited by in corpus (3)

• Reply to "Comment(s) to "Consequences of the single-pair measurement of the Bell parameter""
• Comment on "Consequences of the single-pair measurement of the Bell parameter"
• Experimental evidence for the physical delocalization of individual photons in an interferometer