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  • Letter

Asymptotically consistent measures of general quantum resources: Discord, non-Markovianity, and non-Gaussianity

Kohdai Kuroiwa1,* and Hayata Yamasaki2,3,†

  • 1Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada N2L 3G1
  • 2Institute for Quantum Optics and Quantum Information – IQOQI Vienna, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
  • 3Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Vienna, Austria

  • *kkuroiwa@uwaterloo.ca
  • hayata.yamasaki@gmail.com

Phys. Rev. A 104, L020401 – Published 2 August, 2021

DOI: https://doi.org/10.1103/PhysRevA.104.L020401

Abstract

Quantum resource theories provide a unified framework to quantitatively analyze inherent quantum properties as resources for quantum information processing. So as to investigate the best way for quantifying resources, desirable axioms for resource quantification have been extensively studied through axiomatic approaches. However, a conventional way of resource quantification by resource measures with such desired axioms may contradict rates of asymptotic transformation between resourceful quantum states due to an approximation in the transformation. In this paper we establish an alternative axiom, asymptotic consistency of resource measures, and we investigate asymptotically consistent resource measures, which quantify resources without contradicting the rates of the asymptotic resource transformation. We prove that relative entropic measures are consistent with the rates for a broad class of resources, i.e., all convex finite-dimensional resources, e.g., entanglement, coherence, and magic, and even some nonconvex or infinite-dimensional resources such as quantum discord, non-Markovianity, and non-Gaussianity. These results show that consistent resource measures are widely applicable to the quantitative analysis of various inherent quantum-mechanical properties.

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