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Coherence as entropy increment for Tsallis and Rényi entropies

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Abstract

Relative entropy of coherence can be written as an entropy difference of the original state and the incoherent state closest to it when measured by relative entropy. The natural question is, if we generalize this situation to Tsallis or Rényi entropies, would it define good coherence measures? In other words, we define a difference between Tsallis entropies of the original state and the incoherent state closest to it when measured by Tsallis relative entropy. Taking Rényi entropy instead of the Tsallis entropy, leads to the well-known distance-based Rényi coherence, which means this expression defined a good coherence measure. Interestingly, we show that Tsallis entropy does not generate even a genuine coherence monotone, unless it is under a very restrictive class of operations. Additionally, we provide continuity estimate for Rényi coherence. Furthermore, we present two coherence measures based on the closest incoherent state when measures by Tsallis or Rényi relative entropy.

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Acknowledgements

A. V. was supported by NSF grant DMS-2105583.

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  1. Department of Mathematics, Philip Guthrie Hoffman Hall, University of Houston, 3551 Cullen Blvd., Houston, TX, 77204-3008, USA

    Anna Vershynina

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Correspondence to Anna Vershynina.

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Vershynina, A. Coherence as entropy increment for Tsallis and Rényi entropies. Quantum Inf Process 22, 127 (2023). https://doi.org/10.1007/s11128-023-03872-y

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