Completely-Positive Non-Markovian Decoherence

Details Completely-Positive Non-Markovian Decoherence Completely-Positive Non-Markovian Decoherence

2004-03-02

arxiv.org/abs/quant-ph/0403018v1

Phys. Rev. A 70, 024301 (2004)

Physics

Quantum Physics

8 pages, 1 figure

Scientific paper

10.1103/PhysRevA.70.024301

We propose an effective Hamiltonian approach to investigate decoherence of a quantum system in a non-Markovian reservoir, naturally imposing the complete positivity on the reduced dynamics of the system. The formalism is based on the notion of an effective reservoir, i.e., certain collective degrees of freedom in the reservoir that are responsible for the decoherence. As examples for completely positive decoherence, we present three typical decoherence processes for a qubit such as dephasing, depolarizing, and amplitude-damping. The effects of the non-Markovian decoherence are compared to the Markovian decoherence.

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