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The information capacity of entanglement-assisted continuous variable measurement

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arxiv 2004.05331 v3 pith:IVVJVYCR submitted 2020-04-11 quant-ph math-phmath.MP

The information capacity of entanglement-assisted continuous variable measurement

classification quant-ph math-phmath.MP
keywords measurementcapacitycontinuousentanglement-assistedentropygaingaussianinformation
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The present paper is devoted to investigation of the entropy reduction and entanglement-assisted classical capacity (information gain) of continuous variable quantum measurements. These quantities are computed explicitly for multimode Gaussian measurement channels. For this we establish a fundamental property of the entropy reduction of a measurement: under a restriction on the second moments of the input state it is maximized by a Gaussian state (providing an analytical expression for the maximum). In the case of one mode, the gain of entanglement assistance is investigated in detail.

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