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Single photon counting experiences

  1. Sep 10, 2006 #1
    Hello,

    Single photons counting is daily life since decades in nuclear physics: gamma rays and X-rays are detected individually since very long. Solid-state detectors are the most used.

    In the visible part of the spectrum, this is becoming daily life also. Detectors have reached very high efficiency.

    I guess that in the microwave or radiowave spectrum single photons counting is not so mainstream or even impossible.

    Would some of you know what are currently the lowest frequencies (or energies) where single-photons detections have been performed? Have single photon detectors been built for millimeter waves, for example? Could you also indicate what are the limitations or difficulties and their physical reasons?

    Thanks,

    Michel
     
  2. jcsd
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