Abstract
The use of photoelectric detectors for counting photons is commonplace, and even one-photon states can now be realized experimentally.1,2 It is usually taken for granted that a photoelectric detection at some position at some time corresponds to the annihilation of a photon at that place at that time. Of course, the limited detection efficiency of practical detectors means that the photon number cannot usually be determined unambiguously.
© 1986 Optical Society of America
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