The information capacity of entanglement-assisted continuous variable measurement

• URL: http://arxiv.org/abs/2004.05331v3
• Date: Tue, 19 May 2020 04:24:55 GMT
• Title: The information capacity of entanglement-assisted continuous variable measurement
• Abstract summary: We investigate the entropy reduction and entanglement-assisted classical capacity (information gain) of continuous variable quantum measurements. We establish a fundamental property of the entropy reduction of a measurement. In the case of one mode, the gain of entanglement assistance is investigated in detail.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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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