Nonlinear interferometry via fock-state projection

G. Khoury*, H. S. Eisenberg, E. J.S. Fonseca, D. Bouwmeester

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


We use a photon-number-resolving detector to monitor the photon-number distribution of the output of an interferometer, as a function of phase delay. As inputs we use coherent states with mean photon number up to seven. The postselection of a specific Fock (photon-number) state effectively induces high-order optical nonlinearities. Following a scheme by Bentley and Boyd [Opt. Express 12, 5735 (2004).OPEXFF1094-408710.1364/OPEX.12.005735], we explore this effect to demonstrate interference patterns a factor of 5 smaller than the Rayleigh limit.

Original languageAmerican English
Article number203601
JournalPhysical Review Letters
Issue number20
StatePublished - 2006
Externally publishedYes


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