Operational reality of quantum nonlocality

R. Srikanth
Phys. Rev. A 106, 012221 – Published 28 July 2022

Abstract

Does the remote measurement disturbance of the quantum state of a system B by a 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 the relativistic signal locality. It furthermore suggests a natural reason why a convex operational theory should be nonsignaling, namely, to ensure consistency between the properties of reduced systems and those of single systems.

  • Received 30 August 2021
  • Revised 6 July 2022
  • Accepted 15 July 2022

DOI:https://doi.org/10.1103/PhysRevA.106.012221

©2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

R. Srikanth

  • Theoretical Sciences Division, Poornaprajna Institute of Scientific Research, Bidalur Post, Devanahalli, Bengaluru 562164, India

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Issue

Vol. 106, Iss. 1 — July 2022

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