Passive States Optimize the Output of Bosonic Gaussian Quantum Channels

An ordering between the quantum states emerging from a single-mode gauge-covariant bosonic Gaussian channel is proved. Specifically, we show that within the set of input density matrices with the same given spectrum, the element passive with respect to the Fock basis (i.e., diagonal with decreasing...

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Bibliographic Details
Published in:IEEE transactions on information theory 2016-05, Vol.62 (5), p.2895-2906
Main Authors: De Palma, Giacomo, Trevisan, Dario, Giovannetti, Vittorio
Format: Article
Language:English
Subjects:
Attenuators
Eigenvalues
Eigenvalues and eigenfunctions
Electromagnetic radiation
Elementary particle vacuum
Entropy
Information theory
Normal distribution
Probability distribution
Quantum mechanics
Quantum theory
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Summary:An ordering between the quantum states emerging from a single-mode gauge-covariant bosonic Gaussian channel is proved. Specifically, we show that within the set of input density matrices with the same given spectrum, the element passive with respect to the Fock basis (i.e., diagonal with decreasing eigenvalues) produces an output, which majorizes all the other outputs emerging from the same set. When applied to pure input states, our finding includes as a special case the result of Mari et al., Nat. Comm. 5, 3826 (2014) which implies that the output associated to the vacuum majorizes the others.
ISSN:0018-9448
1557-9654
DOI:10.1109/TIT.2016.2547426