Universality of Decoherence

Details Universality of Decoherence Universality of Decoherence

2000-06-26

arxiv.org/abs/quant-ph/0006117v1

Phys. Rev. Lett. {\bf 86}, 2913 (2001)

Physics

Quantum Physics

4 revtex pages, no figures

Scientific paper

10.1103/PhysRevLett.86.2913

We consider environment induced decoherence of quantum superpositions to mixtures in the limit in which that process is much faster than any competing one generated by the Hamiltonian $H_{\rm sys}$ of the isolated system. While the golden rule then does not apply we can discard $H_{\rm sys}$. By allowing for simultaneous couplings to different reservoirs, we reveal decoherence as a universal short-time phenomenon independent of the character of the system as well as the bath and of the basis the superimposed states are taken from. We discuss consequences for the classical behavior of the macroworld and quantum measurement: For the decoherence of superpositions of macroscopically distinct states the system Hamiltonian is always negligible.

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