Quantum Resource Theories beyond Convexity

• URL: http://arxiv.org/abs/2405.05785v2
• Date: Mon, 26 Aug 2024 12:38:56 GMT
• Title: Quantum Resource Theories beyond Convexity
• Authors: Roberto Salazar, Jakub Czartowski, Ricard Ravell Rodríguez, Grzegorz Rajchel-Mieldzioć, Paweł Horodecki, Karol Życzkowski,
• Abstract summary: A class of quantum resource theories, based on non-linear standardovian-shape sets, is presented. Proposed techniques provide useful tools to describe quantum discord, total composite quantum systems and to estimate non-Markity of an analyzed quantum dynamics. In all cases, the non-linear witnesses introduced here outperform the standard witnesses.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A class of quantum resource theories, based on non-convex star-shape sets, presented in this work captures the key quantum properties that cannot be studied by standard convex theories. We provide operational interpretations for a resource of this class and demonstrate its advantage to improve performance of correlated quantum discrimination tasks and testing of quantum combs. Proposed techniques provide useful tools to describe quantum discord, total correlations in composite quantum systems and to estimate the degree of non-Markovianity of an analyzed quantum dynamics. Other applications include the problem of unistochasticity of a given bistochastic matrix, with relevance for quantization of classical dynamics and studies of violation of CP-symmetry in high energy physics. In all these cases, the non-linear witnesses introduced here outperform the standard linear witnesses. Importance of our findings for quantum information theory is also emphasized.

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