Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Energy of interacting particle and time evolution of p(x)

  1. Apr 11, 2013 #1

    jshrager

    User Avatar
    Gold Member

    In classical QM, using a photon to measure the location or momentum of an electron collapses the electron's wave function at the point of measurement, which then, over time, spreads out again (what I'll call "diffuses"). Fine. The question is: Does the energy of the measuring photon change the time course of the diffusion process, and if so, in which direction? I.e., does a higher energy photon lead to a faster or slower diffusion, or no change at all? Does the answer differ if the energy of the measuring photon is increased by virtue of wavelength (i.e., more blue) v. being multiple coherent photons at the same wavelength (e.g., from a laser)?
     
  2. jcsd
  3. Apr 11, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    It depends on the setup. A scattered photon (i. e. a "measurement") changes the momentum of the particle, and a photon of higher energy (with the same scattering angle) will transfer more momentum on the particle. The uncertainty, however, can be different and depends on the setup.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Energy of interacting particle and time evolution of p(x)
Loading...