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New to Feynman Path Integral

  1. Mar 8, 2004 #1
    I am pretty new to the subject and hope someone can give me certain links to start off.

    We can express the time evolutions of a quantum mechanical state of a system as :
    |psi(Xf,T)> = Gv(Xf,T;X0,0) |psi(X0,0)>

    Now Gv can be expressed as a discretized Feynman Path integral which comes out to be a pretty complex integral (equation 4 in attached file). I am unable to understand as to how should I code a program to calulate this integral. any ideas!!

    Attached Files:

  2. jcsd
  3. Mar 10, 2004 #2
    An excellent exposition of path integrals is available in Anthony Zee's book, Qyuantum Field Theory in a Nutshell.
  4. Mar 23, 2004 #3
    I would suggest looking up Monte Carlo integration in a computational physics book, for example, Rubin Landau's or David Cook's.
  5. Apr 9, 2004 #4
    some solution but...

    I found an easy approach to calulate the Feynman propogator using Feynman path integral approach. Interested users can refer to paper titled:

    "Three Methods for calculating the Feynman Propogator" by

    However I now have one question. In this paper the feynman path was calulated using lagrangian for a quantum oscillator. Could anyone tell me how practical can this turn out to be. For e.g. can we make measurements of a state of a quantum oscillator. If we can then I think we should be able to use this approach to predict the output or make some sort of quantum gates. I haven't fully formalise if anything like this is possible. Maybe someone can tell me if this can be feasible at all or am I missing out some crucial point.

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