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.

arXiv:quant-ph/0112002Physical Review AApr 15, 2002302 citations

arXiv:1001.1704 · Physics Letters A

Quantum communication with photon-number entangled states and realistic photodetection

Vladyslav C. Usenko, Matteo G. A. Paris

Published Jan 12, 2010• 8 citations

arXiv HTML PDF

DOI: 10.1016/j.physleta.2010.01.016

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n=0,1,2,\dots{}.

This protocol does not only provide the possibility to conditionally generate highly entangled photon number states as resource for quantum information protocols but also allows one to test and hence purify this type of quantum states in a communication scenario, which is of great practical importance. The scheme is especially attractive as a generalization to many modes allows for distribution and purification of entanglement in networks. In an alternative working mode, the setup allows for quantum nondemolition number resolved photodetection in the optical domain.