Unitary Evolution Between Pure and Mixed States
arXiv:quant-ph/9504019 · doi:10.1103/PhysRevLett.76.1192
Abstract
We propose an extended quantum mechanical formalism that is based on a wave operator $\vr$, which is related to the ordinary density matrix via $ρ=\vr\vr^\dagger$. 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.
13 pages, latex. Revised version. To appear in Phys. Rev. Lett
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