Editing Quantum information (section)

====B92====

B92 is a simpler version of BB84.<ref name="Bennett1992"/>

The main difference between B92 and BB84:

* B92 only needs two states
* BB84 needs 4 polarization states

Like the BB84, Alice transmits to Bob a string of photons encoded with randomly chosen bits but this time the bits Alice chooses the bases she must use. Bob still randomly chooses a basis by which to measure but if he chooses the wrong basis, he will not measure anything which is guaranteed by quantum mechanics theories. Bob can simply tell Alice after each bit she sends whether he measured it correctly.<ref name="Haitjema2007"/>