Qubit-qunit decomposition of quantum channel

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Problem of classification of parallel quantum channels for information transfer is studied by method of ladder operators. Detailed compared to http://arxiv.org/abs/quant-ph/0702076 presentation of method of ladder operators is given. Examples of paired channel and qubit-qunit pair are added. Relations between eigenvalues of density matrices of composite channel and its subchannels determining presence/absence of entanglement of arbitrary mixed state of channel are obtained.
27 pages

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/163931

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0807.0036
 http://arxiv.org/abs/0807.0036

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arXiv