Connection between decoherence and fidelity decay in echo dynamics

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.042105· OSTI ID:20646335

Gorin, T; Strunz, W T ^[1]; Prosen, T ^[2]; Seligman, T H ^[3]

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1. Theoretische Quantendynamik, Albert-Ludwigs-Universitaet, Hermann-Herder-Strasse. 3, 79104 Freiburg (Germany)
2. Physics Department, Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana (Slovenia)
3. Centro Internacional de Ciencias, C.P. 62131 Cuernavaca, Morelos (Mexico)

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.

• OSTI ID: 20646335
• Journal Information: Physical Review. A, Vol. 70, Issue 4; Other Information: DOI: 10.1103/PhysRevA.70.042105; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COUPLING
DECAY
DYNAMICS
EVOLUTION
QUANTUM MECHANICS