Fidelity-Based Smooth Min-Relative Entropy: Properties and Applications

• URL: http://arxiv.org/abs/2305.05859v2
• Date: Tue, 28 May 2024 03:42:25 GMT
• Title: Fidelity-Based Smooth Min-Relative Entropy: Properties and Applications
• Authors: Theshani Nuradha, Mark M. Wilde,
• Abstract summary: We show that the fidelity-based smooth min-relative entropy satisfies several basic properties, including the data-processing inequality. We also show how the fidelity-based smooth min-relative entropy provides one-shot bounds for operational tasks in general resource theories.
• Score: 5.211732144306638
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The fidelity-based smooth min-relative entropy is a distinguishability measure that has appeared in a variety of contexts in prior work on quantum information, including resource theories like thermodynamics and coherence. Here we provide a comprehensive study of this quantity. First we prove that it satisfies several basic properties, including the data-processing inequality. We also establish connections between the fidelity-based smooth min-relative entropy and other widely used information-theoretic quantities, including smooth min-relative entropy and smooth sandwiched R\'enyi relative entropy, of which the sandwiched R\'enyi relative entropy and smooth max-relative entropy are special cases. After that, we use these connections to establish the second-order asymptotics of the fidelity-based smooth min-relative entropy and all smooth sandwiched R\'enyi relative entropies, finding that the first-order term is the quantum relative entropy and the second-order term involves the quantum relative entropy variance. Utilizing the properties derived, we also show how the fidelity-based smooth min-relative entropy provides one-shot bounds for operational tasks in general resource theories in which the target state is mixed, with a particular example being randomness distillation. The above observations then lead to second-order expansions of the upper bounds on distillable randomness, as well as the precise second-order asymptotics of the distillable randomness of particular classical-quantum states. Finally, we establish semi-definite programs for smooth max-relative entropy and smooth conditional min-entropy, as well as a bilinear program for the fidelity-based smooth min-relative entropy, which we subsequently use to explore the tightness of a bound relating the last to the first.

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