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The entropy gain of infinite-dimensional quantum channels

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arxiv 1003.5765 v1 pith:YOUE6NOA submitted 2010-03-30 math-ph math.MPquant-ph

classification math-phmath.MPquant-ph
keywords entropygainchannelsminimalgaussianinfinite-dimensionalalwaysattained
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abstract

In the present paper we study the entropy gain $H(\Phi [\rho])-H(\rho)$ for infinite-dimensional channels $\Phi$. We show that unlike finite-dimensional case where the minimal entropy gain is always nonpositive \cite{al}, there is a plenty of channels with positive minimal entropy gain. We obtain the new lower bound and compute the minimal entropy gain for a broad class of Bosonic Gaussian channels by proving that the infimum is attained on the Gaussian states.

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  1. Information geometry of bosonic Gaussian thermal states

    quant-ph 2024-11 conditional novelty 5.0 of 10

    Exact integral formulas are derived for the information matrices, derivatives, and symmetric logarithmic derivatives of bosonic Gaussian thermal states.

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