The Real Density Matrix

Details The Real Density Matrix The Real Density Matrix

2003-02-24

arxiv.org/abs/quant-ph/0302176v5

Quantum Information Processing 1:511-38, 2003 (see http://www.kluweronline.com/issn/1570-0755)

Physics

Quantum Physics

Contributed to Feynman Festival Proceedings; 25 pages, 8 EPS figures (PACS: 03.65.Ca, 03.67.-a, 33.25.+k, 02.10.Xm); v2 fixes

Scientific paper

We introduce a nonsymmetric real matrix which contains all the information that the usual Hermitian density matrix does, and which has exactly the same tensor product structure. The properties of this matrix are analyzed in detail in the case of multi-qubit (e.g. spin = 1/2) systems, where the transformation between the real and Hermitian density matrices is given explicitly as an operator sum, and used to convert the essential equations of the density matrix formalism into the real domain.

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