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Assuming that equal space on each side of the rotator makes spontaneous four-wave mixing equally likely one each side, the output state of the photons is maximally entangled:
::<math>|\psi\rangle=\frac{1}{\sqrt{2}}(|H_s,H_i\rangle+e^{i\phi}|V_s,V_i\rangle)=\frac{1}{\sqrt{2}}(|00\rangle_L+e^{i\phi}|11\rangle_L)</math>.
States generated this way could potentially be used to build a cluster state using the Browne-Rudolph protocol.
== References ==
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