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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Generation of correlated photons in microstructure fibers

Jingyun Fan, Alan L. Migdall

Published Aug 18, 2005• 0 citations
Publisher

Abstract

The gains of Four-wave mixing and Raman scattering in an optical fiber vary with wavelength. We use this wavelength variation to experimentally optimize the four-wave mixing relative to the Raman scattering, resulting in high photon coincidence rates and high coincidence/accidental contrast ratios. We obtain a photon coincidence rate of 53.7 kHz/mW/nm with a coincidence/accidental contrast of 10:1 in a 1.8 m microstructure fiber. We discuss the use of this fiber as a source for photon-counting detector efficiency calibrations.

DOI
10.1117/12.612736

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The gains of Four-wave mixing and Raman scattering in an optical fiber vary with wavelength. We use this wavelength variation to experimentally optimize the four-wave mixing relative to the Raman scattering, resulting in high photon coincidence rates and high coincidence/accidental contrast ratios. We obtain a photon coincidence rate of 53.7 kHz/mW/nm with a coincidence/accidental contrast of 10:1 in a 1.8 m microstructure fiber. We discuss the use of this fiber as a source for photon-counting detector efficiency calibrations.
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We demonstrate greatly improved results for the production of correlated photon-pairs using the four-photon scattering process in silica fiber. We achieve a true-coincidence-count to accidental-coincidence-count ratio greater than 10, when the photon-pair production rate is about 0.04 /pulse. This represents a four-fold improvement over our previous results. The contribution of spontaneous Raman scattering, the primary cause of uncorrelated photons that degrades the fidelity of this source, is reduced by decreasing the wavelength detuning between the correlated photons and the pump photons and by using polarizers to remove the cross-polarized Raman-scattered photons. Excess Raman scattering could be further suppressed by cooling the silica fiber. Even without cooling the fiber, the achieved 10 to 1 ratio of true-coincidence to accidental-coincidence makes the fiber source of correlated photon-pairs a useful tool for realizing various quantum-communication protocols.
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We study the generation of correlated photon pairs via spontaneous four-wave mixing (SFWM) in a 15 cm long micro/nano-fiber (MNF). The MNF is properly fabricated to satisfy the phase-matching condition for generating the signal and idler photon pairs at wavelengths of about 1310 and 851 nm, respectively. Photon-counting measurements yield a coincidence-to-accidental ratio of 530 for a photon production rate of about 0.002 (0.0005) per pulse in the signal (idler) band. We also analyze the spectral information of the signal photons originating from SFWM and Raman scattering (RS). In addition to discovering some unique features of RS, we find the bandwidth of the individual signal photons is much greater than the calculated value for the MNF with homogeneous structure. Our investigations indicate the MNF is a promising candidate for developing the sources of nonclassical light and the spectral property of photon pairs can be used to noninvasively test the diameter and homogeneity of the MNF.