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

Doyeol Ahn, Jinhyoung Lee, M. S. Kim, S. W. Hwang

Research output: Contribution to journalArticlepeer-review


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. 5555 2002 The American Physical Society.

Original languageEnglish
Pages (from-to)4
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - 2002


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