Accessible information of a general quantum Gaussian ensemble

• URL: http://arxiv.org/abs/2102.01981v3
• Date: Tue, 8 Mar 2022 08:34:07 GMT
• Title: Accessible information of a general quantum Gaussian ensemble
• Abstract summary: It is shown that the maximizing measurement is Gaussian, constituting a far-reaching generalization of the optical heterodyning. This substantially extends the previous result concerning the gauge-invariant case, even for a single bosonic mode.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Accessible information, which is a basic quantity in quantum information theory, is computed for a general quantum Gaussian ensemble under certain "threshold condition". It is shown that the maximizing measurement is Gaussian, constituting a far-reaching generalization of the optical heterodyning. This substantially extends the previous result concerning the gauge-invariant case, even for a single bosonic mode.

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