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May decoherence be reversible?

  1. Jul 14, 2013 #1


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    I found an interesting paper
    here a two level system is measured by a harmonic oscillator(the apparatus). the apparatus is coupled to its environment, a bath of oscillators.
    The article shows how the reduced matrix of S+ A decoheres (the off diagonal elements tend to zero).
    I am looking for a similar calculation with an environment reduced to a single oscillator.
    I think that we would find the off diagonal initial values after some time.
    So there would be a revival of coherence in a cyclic process.
    Have you a link?
  2. jcsd
  3. Jul 15, 2013 #2


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    You are right, decoherence is reversible. When environment consists of a small number degrees of freedom, the typical recurrence time is relatively small. But when the number N of environment degrees of freedom is large, the recurrence time increases exponentially with N, implying that it appears irreversible for all practical purposes.
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