The operational reality of quantum nonlocality

• URL: http://arxiv.org/abs/2008.03302v3
• Date: Sat, 30 Jul 2022 16:59:54 GMT
• Title: The operational reality of quantum nonlocality
• Authors: R. Srikanth
• Abstract summary: We argue that the disturbance in question is real for a subset of steerable correlations. This result highlights the distinction between quantum no-signaling and relativistic signal-locality.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Does the remote measurement-disturbance of the quantum state of a system $B$ by measurement on system $A$ entangled with $B$, constitute a real disturbance -- i.e., an objective alteration -- of $B$ in an operational sense? Employing information theoretic criteria motivated by operational considerations alone, we argue that the disturbance in question is real for a subset of steerable correlations. This result highlights the distinction between quantum no-signaling and relativistic signal-locality. It furthermore suggests a natural reason why a convex operational theory should be non-signaling: namely, to ensure the consistency between the properties of reduced systems and those of single systems.

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