By combining a coherent state with fields from a number of parametric down-conversion processes, we are able to generate arbitrary N-photon entangled states, including the maximally entangled photon-number state or the so-called NOON state (N,0⟩+0,N⟩). This is achieved through destructive quantum interference for the cancellation of the unwanted states.
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Liu et al. (2006) studied this question.
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