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Time reversibility

  1. Jul 29, 2013 #1
    i read a text at www.askmathmacian.com, and i don't understood this

    "QM requires that time-reversibility (or “unitarity”, to a professional) holds"

    why QM need time-reversibility?
    and what's relation between time-reversibility and unitarity?
  2. jcsd
  3. Jul 29, 2013 #2

    Jano L.

    User Avatar
    Gold Member

    More transparent statement:

    The time-dependent Schroedinger equation is time-symmetric. This means that for any its solution

    and any ##t_0## the function

    \psi^*(r, t_0- t)

    is also its solution.
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