The creation of large photon-number path entanglement conditioned on photodetection

Abstract

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.

6 pages, 4 figures

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• Two-photon diffraction and quantum lithography
• Conditional generation of N-photon entangled states of light
• Linear optics and projective measurements alone suffice to create large-photon-number path entanglement

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