For our purposes it can simply be viewed as a device that has two input and two output ports, which we label with ∣ 0 ⟩ ∣0⟩ and ∣ 1 ⟩ ∣1⟩ as in Figure 3. 1: A symmetric beam-splitter, with input ports on the bottom and the left sides, and output ports on. The relation between the classical field amplitudes, and produced by the beam splitter is translated into the. Some require the output ports to be at 0° and 90° relative to the input beam (possibly without any beam offset of the transmitted beam), while others require two parallel outputs or some other configuration. well-collimated wavepacket propagating in free spaceA and arriving at one of the input ports can, to good approximation, be said to have frequency 𝜔𝜔, wave- vector 𝒌𝒌= (𝜔𝜔𝑐𝑐⁄)𝜿𝜿�, and.
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