Two-time quantities as elements of physical reality
- URL: http://arxiv.org/abs/2404.10697v1
- Date: Tue, 16 Apr 2024 16:15:26 GMT
- Title: Two-time quantities as elements of physical reality
- Authors: Lucas Maquedano, Alexandre D. Ribeiro, Ana C. S. Costa, Renato M. Angelo,
- Abstract summary: We argue that a two-time correlator should actually be regarded as an average involving a novel single physical observable.
We provide examples showing that the presumed constituents of a two-time correlator and the proposed two-time operator itself cannot be simultaneous elements of the physical reality.
- Score: 41.94295877935867
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: In recent years, time correlators have received renewed attention, especially under the guise of identifiers of nonclassical correlations. However, the physical interpretation of these objects, and more generally of multi-times variables, remains ambiguous, which may be one of the reasons why they are so difficult to measure. In this work, we introduce and advance the perspective that a two-time correlator should actually be regarded as an average involving a novel single physical observable, one that cannot be rephrased in terms of the primitive ones, according to quantum principles. In particular, we provide examples showing that the presumed constituents of a two-time correlator and the proposed two-time operator itself cannot be simultaneous elements of the physical reality.
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