Quantum channels showing superadditivity in capacity
This was significantly extended from the previous article quant-ph/9705043,especially in an information theoretic aspect, by adding new results.
quant-ph↗
arXiv subjects
Masayuki Izutsu
Publications and source records attributed to Masayuki Izutsu.
Realization of a collective decoding of codeword states
This was also extended from the previous article quant-ph/9705043, especially in a realization of the decoding process.
quant-ph↗
A simple quantum channel having superadditivity of channel capacity
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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