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2 single photons, each in a different input mode of the polarising beam splitter, will go to the same output mode if they have the opposite polarization. |
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====Type-I fusion====
In type-I fusion, photons with either vertical or horizontal polarization are injected into modes <math>a</math> and <math>b</math>, connected by a polarizing beam splitter. Each of the photons sent into this system is part of a Bell pair that this method will try to entangle. Upon passing through the polarizing beam splitter, the two photons will go opposite ways if they have the same polarization or the same way if they have the
::<math>|H_a,H_b\rangle\rightarrow|H_a,H_b\rangle</math>
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