Completely positive non-Markovian decoherence

J. Lee, I. Kim, D. Ahn, Helen McAneney, Myung Kim

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)024301
Number of pages1
JournalPhysical Review A
Issue number2
Publication statusPublished - Aug 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics


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