coincidence counting, quantum physics, multiple detector systems
In a coincidence measurement two or more measurement events, that have a well-defined temporal correlation, are evaluated. From the temporal correlation of the measured events different information can be deduced, for example, the measured events can be discriminated against background events (which do not show the coincidence signature). For coincidence measurements either several detectors are employed or multiple-hit capable detectors are used which are able to register the occurrence of several events with short dead times. Typical applications that make use of the coincidence approach include the detection of entangled photon pairs.