Parametric fluorescence in periodically poled silica fibers

Bonfrate, G.; Pruneri, Valerio; Kazansky, Peter G.; Tapster, P R; Rarity, John

doi:10.1063/1.125013

Cited by 58 publications

(46 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two of them 8,9 consisted in detecting Hanbury Brown-Twiss type coincidences on the whole downconversion signal divided by a 50:50 beam splitter. The third experiment 10 measured a Franson-type two-photon interference effect using an unbalanced Michelson interferometer.…”

mentioning

confidence: 99%

Generation of correlated photons in controlled spatial modes by downconversion in nonlinear waveguides

2001

View full text Add to dashboard Cite

We report the observation of correlated photon pairs generated by spontaneous parametric down-conversion in a quasi-phase matched KTiOPO 4 nonlinear waveguide. The highest ratio of coincidence to single photon count rates observed in the 830 nm wavelength region exceeds 18%. This makes nonlinear waveguides a promising source of correlated photons for metrology and quantum information processing applications. We also discuss possibilities of controlling the spatial characteristics of the down-converted photons produced in multimode waveguide structures.OCIS codes: 270.5290, 060.4370Spontaneous parametric down-conversion is a wellestablished and practical method for generating pairs of correlated photons. Such pairs are a key ingredient of many experiments testing the foundations of quantum mechanics and in quantum information processing. 1Correlated photons have been also used in a number of metrologic applications. 2-4In this paper we report observation of two-photon correlations in the spontaneous parametric down-conversion generated in a quasi-phase-matched KTiOPO 4 (KTP) waveguide using a χ (2) nonlinearity. As a source of correlated photon pairs, such nonlinear waveguides present several essential advantages over bulk crystals, the typical medium for such sources. First, the technique of quasi-phase-matching (QPM) allows one to utilize larger nonlinear coefficients in some materials, thus leading to substantially higher two-photon production rates. Secondly, the waveguide structure provides a means to control precisely the spatial characteristics of generated photons, as the down-conversion process is confined to well defined transverse modes.5 Appropriate control of the spatio-temporal mode structure of the photons is a critical issue in experiments involving interference between multiple photon pairs.1 When bulk crystals are used to realize the parametric process, high visibility of the interference can be achieved only by heavy spatial filtering of the downconversion signal, which dramatically reduces the useful fraction of photon pairs. In contrast, downconversion in a nonlinear waveguide can provide output in a single spatial mode, which ensures good interference without filtering with a significantly larger sample of photon pairs. This feature, combined with the potential of engineering the temporal properties of the downconverted photons in QPM structures, 6 opens up novel possibilities to control the spatio-temporal characteristics of correlated photon pairs. The use of nonlinear waveguides thus provides a route to the efficient, if random, generation of "heralded" single photons, alternatively to solid-state sources. 7Observation of parametric down-conversion in nonlinear waveguides has been the subject of three recent experiments. Two of them 8,9 consisted in detecting Hanbury Brown-Twiss type coincidences on the whole downconversion signal divided by a 50:50 beam splitter. The third experiment 10 measured a Franson-type two-photon interference effect using an unbalanced Michelson interfero...

show abstract

mentioning

confidence: 99%

Generation of correlated photons in controlled spatial modes by downconversion in nonlinear waveguides

2001

View full text Add to dashboard Cite

show abstract

“…Over the past few years, various attempts have been made to develop more efficient photon-pair sources, but all have relied on the down-conversion process [3]- [6]. Of particular note is [4], in which the effective of periodically poled silica fibers was used. In this letter, we report the first, to the best of our knowledge, photon-pair source that is based on the Kerr nonlinearity ( ) of standard fiber.…”

mentioning

confidence: 99%

All-fiber photon-pair source for quantum communications

Fiorentino

Voss

Sharping

et al. 2002

IEEE Photon. Technol. Lett.

274

283

View full text Add to dashboard Cite

Abstract-In this letter, we present a source of quantum-correlated photon pairs based on parametric fluorescence in a fiber Sagnac loop. The photon pairs are generated in the 1550-nm fiber-optic communication band and detected with InGaAs-InP avalanche photodiodes operating in a gated Geiger mode. A generation rate 10 3 pairs/s is observed, which is limited by the detection electronics at present. We also demonstrate the nonclassical nature of the photon correlations in the pairs. This source, given its spectral properties and robustness, is well suited for use in fiber-optic quantum communication and cryptography networks.Index Terms-Fiber four-wave mixing, parametric amplifiers, photon counting, quantum communication, quantum cryptography. EFFICIENT generation and transmission of quantum-correlated photon pairs, especially in the 1550-nm fiber-optic communication band, is of paramount importance for practical realization of the quantum communication and cryptography protocols [1]. The workhorse source employed in all implementations, thus far [2] has been based on the process of spontaneous parametric down-conversion in second-order [ ] nonlinear crystals. Such a source, however, is not compatible with optical fibers as large coupling losses occur when the pairs are launched into the fiber. This severely degrades the correlated photon-pair rate coupled into the fiber, since the rate depends quadratically on the coupling efficiency. From a practical standpoint, it would be advantageous if a photon-pair source could be developed that not only produces photons in the communication band but also can be spliced to standard telecommunication fibers with high efficiency. Over the past few years, various attempts have been made to develop more efficient photon-pair sources, but all have relied on the down-conversion process [3]- [6]. Of particular note is [4], in which the effective of periodically poled silica fibers was used. In this letter, we report the first, to the best of our knowledge, photon-pair source that is based on the Kerr nonlinearity ( ) of standard fiber. Quantum-correlated photon pairs are observed and characterized in the parametric fluorescence of four-wave mixing (FWM) in dispersion-shifted fiber (DSF).The FWM process takes place in a nonlinear-fiber Sagnac interferometer (NFSI), shown schematically in Fig. 1. Previ- ously, we have used this NFSI to generate quantum-correlated twin beams in the fiber [7]. The NFSI consists of a fused-silica 50/50 fiber coupler spliced to 300 m of DSF having zero-dispersion wavelength nm. It can be set as a reflector with proper adjustment of the intraloop FPC to yield a transmission coefficient 30 dB. When the injected pump wavelength is slightly greater than , FWM in the DSF is phase matched [8]. Two pump photons of frequency scatter into a signal photon and an idler photon of frequencies and , respectively, where . Signal-idler separations of 20 nm can be easily obtained with use of commercial DSF [7]. The pump is a mode-locked train of 3-ps-long pulses that a...

show abstract

“…The chapter also concentrates on nonlinear scattering in silica fibers because nowadays those are the most common and widely used types of fibers. Gas-filled hollow core fibers (Benabid et al, 2005) and ion doped fibers (Digonnet, 2001) are not considered here, and it is assumed that the fiber has not been subjected to poling (Bonfrate et al, 1999;Huy et al, 2007;Kazansky et al, 1997), so that the main non linearity is of third order. In this context the most important spontaneous nonlinear scattering processes are 1. the spontaneous Raman scattering (RS), 2. the spontaneous Brillouin scattering (BS), and 3. the spontaneous four-photon scattering (FPS).…”

Section: Introductionmentioning

confidence: 99%