Decoherence alias Loschmidt echo of the environment

Details Decoherence alias Loschmidt echo of the environment Decoherence alias Loschmidt echo of the environment

2004-05-03

arxiv.org/abs/quant-ph/0405011v1

Phys. Rev. A 70, 042105 (2004)

Physics

Quantum Physics

6 pages, no figures

Scientific paper

Entanglement between a quantum system and its environment leads to loss of coherence in the former. In general, the temporal fate of coherences is complicated. Here, we establish the connection between decoherence of a central system and fidelity decay in the environment for a variety of situations, including both, energy conserving and dissipative couplings. We show how properties of unitary time evolution of the environment can be inferred from the non-unitary evolution of coherences in the central system. This opens up promising ways for measuring Loschmidt echoes in a variety of situations.

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