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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 12 — Dec. 1, 2007
  • pp: 2972–2978

Comparing measurements of g ( 2 ) ( 0 ) performed with different coincidence detection techniques

M. Beck  »View Author Affiliations

JOSA B, Vol. 24, Issue 12, pp. 2972-2978 (2007)

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I present measurements of the degree of second-order coherence g ( 2 ) ( 0 ) for spontaneous parametric downconversion fields and discuss the differences between two-detector (unconditional) and three-detector (conditional) measurements of g ( 2 ) ( 0 ) . An emphasis is placed on comparing measurements made using time-to-amplitude converters (TACs) to those made using a logic circuit, illustrating how the TAC measurements are adversely influenced by dead time effects. Finally, I show how the detrimental effects of dead time when using TACs can be mitigated by renormalizing the measurement results.

© 2007 Optical Society of America

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(030.5290) Coherence and statistical optics : Photon statistics
(270.5290) Quantum optics : Photon statistics

ToC Category:
Coherence and Statistical Optics

Original Manuscript: June 22, 2007
Revised Manuscript: August 28, 2007
Manuscript Accepted: September 17, 2007
Published: November 14, 2007

M. Beck, "Comparing measurements of g(2)(0) performed with different coincidence detection techniques," J. Opt. Soc. Am. B 24, 2972-2978 (2007)

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  4. Some references use the normalized intensity correlation function λ(τ) in place of the degree of second-order coherence; they are related by g(2)(τ)=1+λ(τ).
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  17. I am not alone in associating α and g(2)(0); see also the text by Loudon . It is reasonable for one to think of the three-detector g(2)(0) as being a third-order intensity correlation. However, I prefer to follow Loudon's lead and consider it a conditional g(2)(0).
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