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Joint Measurability, Einstein-Podolsky-Rosen Steering, and Bell Nonlocality

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arxiv 1406.6976 v4 pith:VOIDXJED submitted 2014-06-26 quant-ph

classification quant-ph
keywords quantumbellmeasurementsnonlocalityincompatiblejointmeasurabilitysteering
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We investigate the relation between the incompatibility of quantum measurements and quantum nonlocality. We show that any set of measurements that is not jointly measurable (i.e. incompatible) can be used for demonstrating EPR steering, a form of quantum nonlocality. This implies that EPR steering and (non) joint measurability can be viewed as equivalent. Moreover, we discuss the connection between Bell nonlocality and joint measurability, and give evidence that both notions are inequivalent. Specifically, we exhibit a set of incompatible quantum measurements and show that it does not violate a large class of Bell inequalities. This suggest the existence of incompatible quantum measurements which are Bell local, similarly to certain entangled states which admit a local hidden variable model.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Strict hierarchy between $n$-wise measurement simulability, compatibility structures, and multi-copy compatibility

    quant-ph 2025-06 conditional novelty 7.0 of 10

    The paper orders all known generalizations of measurement incompatibility in a strict chain of inclusions, with n-wise compatible assemblages as the convex hull of n-simulable ones, strictly inside n-copy jointly meas...

  2. Measurement incompatibility and quantum steering via linear programming

    quant-ph 2025-06 conditional novelty 7.0 of 10

    A hierarchy of linear programs computes provable upper and lower bounds on measurement incompatibility and quantum steering, scaling polynomially with the number of measurements.

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