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- W2299224811 abstract "The passive states of a quantum system minimize the average energy among all the states with a given spectrum. We prove that they are the optimal inputs of a large class of lossy quantum channels, in the sense that the output generated by a passive state is still passive and majorizes (i.e. it is less noisy than) the output generated by any other state with the same spectrum. This is an extension of De Palma et al. [arXiv:1511.00293], where the same result is proved for one-mode bosonic Gaussian channels. We also prove that for finite temperature this optimality property can fail already in a two-level system, where the best input is a coherent superposition of the two energy eigenstates." @default.
- W2299224811 created "2016-06-24" @default.
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- W2299224811 date "2016-03-18" @default.
- W2299224811 modified "2023-09-27" @default.
- W2299224811 title "Passive states optimize the output of lossy quantum channels" @default.
- W2299224811 hasPublicationYear "2016" @default.
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