Abstract
Does the remote measurement disturbance of the quantum state of a system by a measurement on system entangled with constitute a real disturbance, i.e., an objective alteration, of 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
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