A simple quantum channel having superadditivity of channel capacity

Details A simple quantum channel having superadditivity of channel capacity A simple quantum channel having superadditivity of channel capacity

1997-05-26

arxiv.org/abs/quant-ph/9705043v1

Phys.Lett. A236 (1997) 1

Physics

Quantum Physics

5 pages, LaTeX, 3 eps figures

Scientific paper

10.1016/S0375-9601(97)00740-8

When classical information is sent through a quantum channel of nonorthogonal states, there is a possibility that transmittable classical information exceeds a channel capacity in a single use of the initial channel by extending it into multi-product channel. In this paper, it is shown that this remarkable feature of a quantum channel, so-called superadditivity, appears even in as low as the third extended coding of the simplest binary input channel. A physical implementation of this channel is indicated based on cavity QED techniques.

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