Connection between decoherence and fidelity decay in echo dynamics

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,...

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Bibliographic Details
Published in:	Physical review. A, Atomic, molecular, and optical physics Vol. 70; no. 4
Main Authors:	Gorin, T., Prosen, T., Seligman, T., Strunz, W.
Format:	Journal Article
Language:	English
Published:	United States 01-10-2004
Subjects:	ATOMIC AND MOLECULAR PHYSICS COUPLING DECAY DYNAMICS EVOLUTION QUANTUM MECHANICS
Online Access:	Get full text
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Summary:	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 nonunitary evolution of coherences in the central system. This opens up promising ways for measuring Loschmidt echoes in a variety of situations.
ISSN:	1050-2947 1094-1622
DOI:	10.1103/PhysRevA.70.042105