Quantum discord, thermal discord, and entropy generation in the minimum error discrimination strategy
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Universidade Federal de Minas Gerais
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We study the classical and quantum correlations in the minimum error discrimination (ME)
of two non-orthogonal pure quantum states. In particular, we consider quantum discord, thermal
discord and entropy generation. We show that ME allows one to reach the accessible information
between the two involved parties, Alice and Bob, in the discrimination process. We determine the
amount of quantum discord that is consumed in the ME and show that the entropy generation is,
in general, higher than the thermal discord. However, in certain cases the entropy generation is very
close to thermal discord, which indicates that, in these cases, the process generates the least possible
entropy. Moreover, we also study the ME process as a thermodynamic cycle and we show that it is
in agreement with the second law of thermodynamics. Finally, we study the relation between the
accessible information and the optimum success probability in ME.
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Minimum error discrimination, Accessible information, Discord, Second law of thermodynamics
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https://www.mdpi.com/1099-4300/21/3/263