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Large photon-number path entanglement is an important resource for enhanced precision measurements and quantum imaging. We present a general constructive protocol to create any large photon number path-entangled state based on the conditional detection of single photons. The influence of imperfect detectors is considered and an asymptotic scaling law is derived.doi:10.1103/physreva.65.052104 fatcat:axb4muv3qfaklajfbjhb5vzpzi