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IEEE Photonics Technology Letters

Wavelength Tunable Source of Correlated Photon Pairs Based on Photonic Crystal Fiber

Jie Su, Liang Cui, Xiaoying Li

Published Apr 18, 2018• 8 citations
Publisher

Abstract

Quantum-correlated photon pairs with tunable wavelength are highly desirable in a number of quantum technologies. In this letter, we demonstrate a wavelength tunable source of the correlated photon pairs based on pulse-pumped spontaneous four-wave mixing in photonic-crystal fiber. The wavelengths of the correlated signal and idler photons can be continuously tuned at room temperature by adjusting the wavelength of pump originating from an ytterbium-doped fiber laser. The tuning range of the idler photons is 757-880 nm and the range of the signal photons is 1310-1610 nm, which covers the 1310- and 1550-nm telecom bands.

DOI
10.1109/lpt.2018.2824850

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Quantum-correlated photon pairs with tunable wavelength are highly desirable in a number of quantum technologies. In this letter, we demonstrate a wavelength tunable source of the correlated photon pairs based on pulse-pumped spontaneous four-wave mixing in photonic-crystal fiber. The wavelengths of the correlated signal and idler photons can be continuously tuned at room temperature by adjusting the wavelength of pump originating from an ytterbium-doped fiber laser. The tuning range of the idler photons is 757-880 nm and the range of the signal photons is 1310-1610 nm, which covers the 1310- and 1550-nm telecom bands.
A one-meter-long high nonlinear photonic crystal fiber is pumped by laser pulse train at room temperature, and the generated correlated idler and signal photons are centred at 830 nm and 1411 nm, respectively. The full widths at half maximum of the broad band filters of the two channel are 15 nm and 35 nm, respectively. The fitting results of single channel photon counts reveal that almost all the photons originate from spontaneous four wave mixing and the influence of Raman scattering is eliminated. When the production rate is 0.0085 photon per pulse, the ratio between coincidence rate and accidental coincidence rate is measured to be 102, which not only confirms the low noise property of the photon pair, but also shows that the photon pair are naturally narrow band, and the collecting efficiency in our experiment is high. Moreover, these high purity photon pairs connect different optical bands, and have potential applications in quantum information technologies.
Based on the spontaneous four wave mixing in micro/nano-fiber (MNF), we report the generation of quantum-correlated photon pairs. The wavelengths of the signal and idler photons are in the 1310 nm and 851 nm bands, respectively. The measured ratio between the coincidence and accidental coincidence rates of signal and idler photons is up to 530. Moreover, we characterize the spectral property of the signal photons in the wavelength range of 1270-1610 nm. The results reveal that the bandwidth of the photon pairs is much greater than the theoretically expected value due to the inhomogeneity of the MNF; while the spectrum of Raman scattering in MNF is different from that in conventional optical fibers and photonic crystal fibers, which may originate from the heating used for fabricating the MNF. Our investigation shows that the MNF is a promising candidate for developing the sources of quantum light in micro- or nanometer-scales, and the spectral property of photon pairs can be used to non-invasively test the diameter and homogeneity of the MNF.
An actual task of quantum communications over long distances is the creation of a bright source of photon pairs operating at standard wavelengths of fiber optic communication lines. In this work, we experimentally investigated the spectral and correlation characteristics of photon pairs generated on the phenomenon of spontaneous four-wave mixing in a highly nonlinear photonic-crystal fiber with a wavelength of one of the photons near 1.5 μm. The demonstrated source can be used as an efficient single photon generator at a telecommunications wavelength with prediction and tuning over a wide spectral range.
We present a source of correlated photon pairs that relies on spontaneous parametric scattering in microstructure fiber. Quantum correlations are shown between photon pairs that are generated through four-photon scattering where the pump photons are degenerate at a wavelength of 749 nm and the signal and idler photons are nondegenerate at wavelengths of 761 nm and 737 nm, respectively. Careful adjustment of the pump wavelength and polarization are shown to be critical to observing quantum correlations.