Self-consistent non-Markovian theory of a quantum-state evolution for quantum-information processing

Myung Kim

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

We study non-Markovian decoherence phenomena by employing projection-operator formalism when a quantum system (a quantum bit or a register of quantum bits) is coupled to a reservoir. By projecting out the degree of freedom of the reservoir, we derive a non-Markovian master equation for the system, which is reduced to a Lindblad master equation in Markovian limit, and obtain the operator sum representation for the time evolution. It is found that the system is decohered slower in the non- Markovian reservoir than the Markovian because the quantum information of the system is memorized in the non-Markovian reservoir. We discuss the potential importance of non-Markovian reservoirs for quantum-information processing.
Original languageEnglish
Pages (from-to)012302
Number of pages1
JournalPhysical Review A
Volume66
Issue number1
Publication statusPublished - Jul 2002

ASJC Scopus subject areas

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

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