Toshiyuki Shimono

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The purpose of these notes is to discuss the relation between the addi-tivity questions regarding the quantities (Holevo) capacity of a quantum channel T and entanglement of formation of a bipartite state ρ. In particular , using the Stinespring dilation theorem, we give a formula for the channel capacity involving entanglement of formation. This can be(More)
An example is given of a qubit quantum channel which requires four inputs to maximize the Holevo capacity. The example is one of a family of channels which are related to 3-state channels. The capacity of the product channel is studied and numerical evidence presented which strongly suggests additivity. The numerical evidence also supports a conjecture(More)
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