Device applications of this work include photon detectors and sources, as well as quantum information processing.

And the image from that eye will be a composite of millions of photon detectors.

Depending on the particular mode of operation, a superconductor-insulator-superconductor Josephson junction can be used as a photon detector or as a mixer.

Single photon detectors made from avalanche photodiodes or .

If your single photon detector isn't really a single photon detector, though, that's very difficult to ensure.

Most single photon detectors can only record the time of the first photon if another arrives very soon thereafter (This effect is called dead time.)

Image noise can also originate in film grain and in the unavoidable shot noise of an ideal photon detector.

These photons emissions are recorded by a sensitive photon detector.

"Single photon detector module"

Having the best possible photon detector available can be very important for precision measurements.