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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 21 — Oct. 8, 2012
  • pp: 23846–23855

MHz rate and efficient synchronous heralding of single photons at telecom wavelengths

Enrico Pomarico, Bruno Sanguinetti, Thiago Guerreiro, Rob Thew, and Hugo Zbinden  »View Author Affiliations


Optics Express, Vol. 20, Issue 21, pp. 23846-23855 (2012)
http://dx.doi.org/10.1364/OE.20.023846


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Abstract

We report on the realization of a synchronous source of heralded single photons at telecom wavelengths with MHz heralding rates and high heralding efficiency. This source is based on the generation of photon pairs at 810 and 1550 nm via Spontaneous Parametric Down Conversion (SPDC) in a 1 cm periodically poled lithium niobate (PPLN) crystal pumped by a 532 nm pulsed laser. As high rates are fundamental for multi-photon experiments, we show that single telecom photons can be announced at 4.4 MHz rate with 45% heralding efficiency. When we focus only on the optimization of the coupling of the heralded photon, the heralding efficiency can be increased up to 80%. Furthermore, we experimentally observe that group velocity mismatch inside long crystals pumped in a pulsed mode affects the spectrum of the emitted photons and their fibre coupling efficiency. The length of the crystal in this source has been chosen as a trade off between high brightness and high coupling efficiency.

© 2012 OSA

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.5290) Quantum optics : Photon statistics
(040.1345) Detectors : Avalanche photodiodes (APDs)
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

History
Original Manuscript: July 3, 2012
Revised Manuscript: September 16, 2012
Manuscript Accepted: September 21, 2012
Published: October 2, 2012

Citation
Enrico Pomarico, Bruno Sanguinetti, Thiago Guerreiro, Rob Thew, and Hugo Zbinden, "MHz rate and efficient synchronous heralding of single photons at telecom wavelengths," Opt. Express 20, 23846-23855 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-21-23846


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