Asymmetric One-Sided Semi-Device-Independent Steerability of Quantum Discordant States

• URL: http://arxiv.org/abs/2307.09116v4
• Date: Wed, 18 Oct 2023 02:44:07 GMT
• Title: Asymmetric One-Sided Semi-Device-Independent Steerability of Quantum Discordant States
• Authors: Chellasamy Jebarathinam (National Cheng Kung University, Taiwan), Debarshi Das, R. Srikanth
• Abstract summary: Superlocality and superunsteerability provide operational characterization of quantum correlations in certain local and unsteerable states respectively. We show that a two-way nonzero quantum discord is not necessary to demonstrate superunsteerability. Just like one-way steerability occurs for certain Bell-local states in a one-sided device-independent way, our result shows that one-way steerability can also occur for certain nonsuperlocal states but in a one-sided semi-device-independent way.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Superlocality and superunsteerability provide operational characterization of quantum correlations in certain local and unsteerable states respectively. Such quantum correlated states have a nonzero quantum discord. A two-way nonzero quantum discord is necessary for quantum correlations pointed out by superlocality. On the other hand, in this work, we demonstrate that a two-way nonzero quantum discord is not necessary to demonstrate superunsteerability. To this end, we demonstrate superunsteerability for one-way quantum discordant states. This in turn implies the existence of one-way superunsteerability and also the presence of superunsteerability without superlocality. Superunsteerability for nonzero quantum discord states implies the occurence of steerability in a one-sided semi-device-independent way. Just like one-way steerability occurs for certain Bell-local states in a one-sided device-independent way, our result shows that one-way steerability can also occur for certain nonsuperlocal states but in a one-sided semi-device-independent way.

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