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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 17824–17830

Experimental direct estimation of nonlinear functionals of photonic quantum states via interferometry with a controlled-swap operation

Sang Min Lee, Sang-Kyung Choi, and Hee Su Park  »View Author Affiliations

Optics Express, Vol. 21, Issue 15, pp. 17824-17830 (2013)

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We propose a multi-photon interferometer with a generalized C-SWAP operation that can estimate Tr[ρ1ρ2ρn], a nonlinear functional of n photonic density matrices. The scheme is demonstrated for three single-photon states whose overlap is experimentally measured as the interference visibility of a control qubit encoded into photonic paths. The validity of this method is verified by comparing the visibility with the results of Hong-Ou-Mandel experiments.

© 2013 OSA

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.4180) Quantum optics : Multiphoton processes
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: May 15, 2013
Revised Manuscript: July 12, 2013
Manuscript Accepted: July 12, 2013
Published: July 18, 2013

Sang Min Lee, Sang-Kyung Choi, and Hee Su Park, "Experimental direct estimation of nonlinear functionals of photonic quantum states via interferometry with a controlled-swap operation," Opt. Express 21, 17824-17830 (2013)

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