Phys. Rev. Lett. 103, 163602 (2009) [4 pages]Efficient Optical Quantum State EngineeringReceived 29 June 2009; published 14 October 2009 We discuss a novel method of efficiently producing multiphoton states using repeated spontaneous parametric down-conversion. Specifically, by attempting down-conversion several times, we can pseudodeterministically add photons to a mode, producing various several-photon states, e.g., Fock states and N00N states (number-path entangled states of the form |NA,0B⟩+|0A,NB⟩). This scheme is exponentially more efficient than previous proposals; we discuss expected performance and experimental limitations. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.163602
DOI:
10.1103/PhysRevLett.103.163602
PACS:
42.50.Dv, 03.67.Bg, 42.65.Lm
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