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arxiv: 0904.0307 · v1 · pith:633CJPZQnew · submitted 2009-04-02 · 🪐 quant-ph

Capacity with energy constraint in coherent state channel

classification 🪐 quant-ph
keywords energycapacityconstraintstatechannelcoherentformulasetting
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We consider two kind of energy constraints when the output state is a coherent state. One is a constraint on the total energy during a fixed period; the other is a constraint on the total energy for a single code. The first setting can be easily dealt with by using the conventional capacity formula. The second setting requires the general capacity formula for a classical-quantum channel.

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