Decoherence at zero temperature

Details Decoherence at zero temperature Decoherence at zero temperature

2003-11-05

arxiv.org/abs/quant-ph/0311019v1

J. Optics B 5,S349 (2003)

Physics

Quantum Physics

Scientific paper

10.1088/1464-4266/5/6/010

Most discussions of decoherence in the literature consider the high-temperature regime but it is also known that, in the presence of dissipation, decoherence can occur even at zero temperature. Whereas most previous investigations all assumed initial decoupling of the quantum system and bath, we consider that the system and environment are entangled at all times. Here, we discuss decoherence for a free particle in an initial Schr\"{o}dinger cat state. Memory effects are incorporated by use of the single relaxation time model (since the oft-used Ohmic model does not give physically correct results).

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