Alternative representation of N \times N density matrix

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We use polarization operators known from quantum theory of angular momentum to expand the $N \times N$ dimensional density operators. Thereby, we construct generalized Bloch vectors representing density matrices. We study their properties and derive positivity conditions for any $N$. We also apply the procedure to study Bloch vector space for a qubit and a qutrit.
22 pages, 7 figures

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/109294

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0602065
 http://arxiv.org/abs/quant-ph/0602065

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arXiv