Related papers: In defense of temporal Tsirelson bound

In defense of temporal Tsirelson bound

URL: http://arxiv.org/abs/2512.24304v1
Date: Tue, 30 Dec 2025 15:53:39 GMT
Title: In defense of temporal Tsirelson bound
Authors: Antoni Wójcik, Jan Wójcik,
Abstract summary: We show that the proposed evolution can be understood within a more conventional framework.<n>We demonstrate that the apparent violation of the bound arises because the measured quantities are not consistent with the assumptions of the Leggett-Garg scenario.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: In a recent paper, Chatterjee et al. [Phys. Rev. Lett 135, 220202 (2025)] analyze and experimentally implement a specific unitary evolution of a simple quantum system. The authors refer to this type of dynamics as a "superposition of unitary time evolutions." They claim that such an evolution enables a violation of the temporal Tsirelson bound in the Leggett-Garg scenario, a claim that is supported by their experimental results. In this work, we show that the proposed evolution can be understood within a more conventional framework, without invoking a superposition of evolutions. Furthermore, we demonstrate that the apparent violation of the bound arises because the measured quantities are not consistent with the assumptions of the Leggett-Garg scenario. This is a slightly extended version of the Comment submitted for publication in Phys. Rev. Lett.

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