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We propose a method for preparing maximal path entanglement with a definitephoton number N, larger than two, using projective measurements. In contrastwith the previously known schemes, our method uses only linear optics.Specifically, we exhibit a way of generating four-photon, path-entangled statesof the form |4,0> + |0,4>, using only four beam splitters and two detectors.These states are of major interest as a resource for quantum interferometricsensors as well as for optical quantum lithography and quantum holography.Comment: 4 pages, 4 figure

Linear optics and projective measurements alone suffice to create large-photon-number path entanglement