Unitary Evolution Between Pure and Mixed States

Details Unitary Evolution Between Pure and Mixed States Unitary Evolution Between Pure and Mixed States

1995-04-26

arxiv.org/abs/quant-ph/9504019v4

Phys.Rev.Lett. 76 (1996) 1192-1195

Physics

Quantum Physics

13 pages, latex. Revised version. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.76.1192

We propose an extended quantum mechanical formalism that is based on a wave operator $\vr$, which is related to the ordinary density matrix via $\rho=\vr\vr^\dagger$. This formalism allows a (generalized) unitary evolution between pure and mixed states. It also preserves much of the connection between symmetries and conservation laws. The new formalism is illustrated for the case of a two level system.

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