S Castelletto et al 2004 New J. Phys. 6 87 doi:10.1088/1367-2630/6/1/087
On the measurement of two-photon single-mode coupling efficiency in parametric down-conversion photon sources
Focus on Single Photons on DemandS Castelletto1, I P Degiovanni1, A Migdall2 and M Ware2
Show affiliationsPart of Focus on Single Photons on Demand
Photon-based quantum information schemes have increased the need for light sources that produce individual photons, with many such schemes relying on optical parametric down-conversion (PDC). Practical realizations of this technology require that the PDC light be collected into a single spatial mode defined by an optical fibre. We present two possible models to describe single-mode fibres coupling with PDC light fields in a non-collinear configuration, that lead to two different results. These approaches include factors such as crystal length and walk-off, non-collinear phase-matching and transverse pump field distribution. We propose an experimental test to distinguish between the two. The goal is to help clarify open issues, such as how to extend the theory beyond the simplest experimental arrangements and, more importantly, to suggest ways to improve the collection efficiency.
- Some corrections were made to this paper on 10 September 2004. These chiefly concerned a minor modification to equation (6), the removal of the Appendix and the text reference to it.
- PACS
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42.65.Lm Parametric down conversion and production of entangled photons
- Subjects
- Dates
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Issue 1 (July 2004)
Received 5 February 2004
Published 29 July 2004
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On the measurement of two-photon single-mode coupling efficiency in parametric down-conversion photon sources
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