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Quantum Physics

Title: Smooth Metric Adjusted Skew Information Rates

Abstract: Metric adjusted skew information, induced from quantum Fisher information, is a well-known family of resource measures in the resource theory of asymmetry. However, its asymptotic rates are not valid asymmetry monotone since it has an asymptotic discontinuity. We here introduce a new class of asymmetry measures with the smoothing technique, which we term smooth metric adjusted skew information. We prove that its asymptotic sup- and inf-rates are valid asymptotic measures in the resource theory of asymmetry. Furthermore, it is proven that the smooth metric adjusted skew information rates provide a lower bound for the coherence cost and an upper bound for the distillable coherence.
Comments: 26 pages, 2 figures. Accepted in Quantum
Subjects: Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech)
Journal reference: Quantum 7, 1012 (2023)
DOI: 10.22331/q-2023-05-22-1012
Cite as: arXiv:2211.12522 [quant-ph]
  (or arXiv:2211.12522v3 [quant-ph] for this version)

Submission history

From: Koji Yamaguchi [view email]
[v1] Tue, 22 Nov 2022 19:00:03 GMT (71kb,D)
[v2] Wed, 19 Apr 2023 13:47:40 GMT (97kb,D)
[v3] Mon, 8 May 2023 21:42:43 GMT (97kb,D)

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