Shared randomness allows violation of macroscopic realism using a single measurement

• URL: http://arxiv.org/abs/2310.15253v1
• Date: Mon, 23 Oct 2023 18:03:46 GMT
• Title: Shared randomness allows violation of macroscopic realism using a single measurement
• Authors: Shubhayan Sarkar
• Abstract summary: We show that if one has access to shared randomness then one can observe a violation of macroscopic realism using a single measurement. We further construct a witness to observe the violation of macroscopic no-signalling.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Macro-realistic description of systems is based majorly on two basic intuitions about the classical world, namely, macrorealism per se, that is, the system is always in a distinct state, and non-invasive measurements, that is, measurements do not disturb the system. Given the assumption of no-signalling in time, one utilizes Leggett-Garg inequalities to observe a violation of macroscopic realism which requires at least three measurements. In this work, we show that if one has access to shared randomness then one can observe a violation of macroscopic realism using a single measurement even if no signalling in time is satisfied. Interestingly, using the proposed scheme one can also rule out a larger class of models, which we term "macroscopic no-signalling" theories which can not violate the no-signalling in time conditions. We further construct a witness to observe the violation of macroscopic no-signalling.

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