How many ports can a beam splitter split at most
While most beam splitters have only two output ports, there are also beam splitters with multiple outputs. In this theory, the four ports of the beam splitter are represented by a photon number state and the action of a creation operation is. Field 1 evolves as E1 ! T E3 + RE4, where T; R are the transmission and re ection coe cients for the beam splitter.
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