Depolarizing channel as a completely positive map with memory

Sonja Daffer*, Krzysztof Wódkiewicz, James D. Cresser, John K. McIver

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    156 Citations (Scopus)


    The master equations that possess a memory kernel leading to a replacement of white noise by colored noise were discussed. The canonical form of the generator that leads to the quantum Markovian master equation for the system density operator was reviewed. It was found that the loss of complete positivity when the memory kernel was present was a feature of the colored noise. An example of a completely positive, trace-preserving map that results from a system-environment coupling that was essentially non-Markovian was also presented.

    Original languageEnglish
    Article number010304
    Pages (from-to)010304-1-010304-4
    Number of pages4
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number1
    Publication statusPublished - Jul 2004


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