Phys. Rev. A 68, 042314 (2003) [11 pages]Conditional linear-optical measurement schemes generate effective photon nonlinearitiesReceived 26 May 2003; published 14 October 2003 We provide a general approach for the analysis of optical state evolution under conditional measurement schemes, and identify the necessary and sufficient conditions for such schemes to simulate unitary evolution on the freely propagating modes. If such unitary evolution holds, an effective photon nonlinearity can be identified. Our analysis extends to conditional measurement schemes more general than those based solely on linear optics. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.042314
DOI:
10.1103/PhysRevA.68.042314
PACS:
03.67.Lx, 42.50.-p, 42.65.-k
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