## Measurement of photon indistinguishability to a quantifiable uncertainty using a Hong–Ou–Mandel interferometer

Applied Optics, Vol. 49, Issue 11, pp. 2173-2182 (2010)

http://dx.doi.org/10.1364/AO.49.002173

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### Abstract

We present a method for using the Hong–Ou–Mandel (HOM) interference technique to quantify photon indistinguishability within an associated uncertainty. The method allows the relative importance of various experimental factors affecting the HOM visibility to be identified, and enables the actual indistinguishability, with an associated uncertainty, to be estimated from experimentally measured quantities. A measurement equation has been derived that accounts for the non-ideal performance of the interferometer. The origin of each term of the equation is explained, along with procedures for their experimental evaluation and uncertainty estimation. These uncertainties are combined to give an overall uncertainty for the derived photon indistinguishability. The analysis was applied to measurements from an inter ferometer sourced with photon pairs from a parametric downconversion process. The measured photon indistinguishably was found to be

© 2010 Optical Society of America

**OCIS Codes**

(120.3940) Instrumentation, measurement, and metrology : Metrology

(190.4410) Nonlinear optics : Nonlinear optics, parametric processes

(270.5585) Quantum optics : Quantum information and processing

**ToC Category:**

Nonlinear Optics

**History**

Original Manuscript: December 8, 2009

Revised Manuscript: March 5, 2010

Manuscript Accepted: March 16, 2010

Published: April 7, 2010

**Citation**

Peter J. Thomas, Jessica Y. Cheung, Christopher J. Chunnilall, and Malcolm H. Dunn, "Measurement of photon indistinguishability to a quantifiable uncertainty using a Hong-Ou-Mandel interferometer," Appl. Opt. **49**, 2173-2182 (2010)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-11-2173

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