Leggett-Garg test of macrorealism using indefinite causal order of measurements

• URL: http://arxiv.org/abs/2311.04484v1
• Date: Wed, 8 Nov 2023 06:28:46 GMT
• Title: Leggett-Garg test of macrorealism using indefinite causal order of measurements
• Authors: A. K. Pan
• Abstract summary: The Leggett-Garg (LG) test is a conceptually elegant approach for probing the compatibility between the notion of macrorealism and quantum theory. We propose a simple and elegant scheme based on indefinite causal order in quantum switch experiment, which enables us to close this loophole.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Macrorealism is a belief that constitutes the core of our perception of reality in the everyday world. The Leggett-Garg (LG) test is a conceptually elegant approach for probing the compatibility between the notion of macrorealism and quantum theory. However, a conclusive LG test hinges on how one fixes the operational invasiveness loophole, i.e., how the statistical form of non-invasive measurability assumption is guaranteed in an LG test. Despite many attempts to close this loophole, no consensus has been achieved yet. In this work, we propose a simple and elegant scheme based on indefinite causal order in quantum switch experiment, which enables us to close this loophole, and eventually, the LG test becomes a conclusive test of macrorealism.

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