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Conference on Lasers and Electro-Optics

Chromatically coupled silicon photonic resonators for high purity single-photon generation

Imad I. Faruque, Gary F. Sinclair, Ben M. Burridge, Will McCutcheon, Massimo Borghi, Jorge Barreto, John Rarity

Published Jan 1, 2020• 1 citation
Publisher

Abstract

We present experimental results on single-photon generation using compact chromatically-coupled resonators on an SOI platform. We measure a purity of 96%, beyond the 92% purity limitation of conventional structures, in agreement with our simulated model.
DOI
10.1364/cleo_qels.2020.ftu4c.1

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Recently, many researchers focus on the integration of single photon sources on an optical chip toward the realization of large-scale quantum information processing.Identical single photons are required to obtain good interference between photons for quantum information processing, for which high "spectral purity" of single photons is required.An appealing scheme is employing the spontaneous four-wave mixing (SFWM) in a silicon micro-ring resonator (MRR) because it allows us to generate high-purity photons without external spectral filters.However, the purity value is limited to 0.92 due to the dispersion property of an MRR We have developed a new scheme to further increase the spectral purity from an MRR by manipulating the spectral phase distribution of the pump pulse.Via exploring several strategies on the spectral phase modulation, we found that the purity of single photon can be increased up to approximately 0.96 breaking the conventional limitation of 0.92 in a standard MRR.We further explore the experimental feasibility of the scheme toward future implementation.
Heralded single photon sources generated through spontaneous four wave mixing in silicon microring resonators are highly demanding for large-scale integrated quantum photonics. However, the spectral purity of conventional microring resonators is limited to 93%, which impacts the quality of quantum interference within photonic circuits. The wavelength dependent coupling between ring and bus waveguides plays a significant role in the generation/heralding of single photons from the resonator. In this letter, we have presented a detailed investigation of the dispersive nature of relatively long directional couplers in order to design a microring resonator in all-pass configuration for chip-scale generation of single photons with maximum purity. In our studies, we have shown that a photon purity level close to 99% (λ ∼ 1550 nm) can be achieved by the use of a dispersive directional coupler in a race-track microring resonator in all-pass configuration, without affecting the photon heralding rate. The design parameters of the device are optimized such that it can be fabricated in commercial CMOS foundries.
Photon pair sources with the capability to tune the wavelength and correlation properties of the generated photons can be useful for quantum applications such as communication, sensing, and computing. Silicon devices based on the SOI (silicon-on-insulator) platform benefits from both tight modal confinement, due to high index contrast between core and cladding, and CMOS compatible manufacturing process, making it a suitable platform for such sources. In the present work, we discuss the possibility of using planar resonant silicon devices with bend radii of a few tens of microns as photon pair sources. We discuss that a silicon nanophotonic chip consisting of either a single microring or coupled microrings can be used to generate photon pairs around 1.55 um. We discuss that the photons are generated in multiple pairs of wavelengths and can be tuned over several nanometers, demonstrating the capability to generate wavelength division multiplexed photon pairs at freely chosen telecommunication-band wavelengths. Further on, we discuss the ease of control over the bi-photon spectrum of the generated photon pairs and its implication in controlling their correlation properties. Uncorrelated photon pairs can be used to herald a single photon, and correlated photon pairs can be used in various quantum applications such as communication and sensing. In the end, we discuss the design parameters of a single microring resonator based sources.
Heralded single photon sources generated through spontaneous four wave mixing in silicon microring resonators are highly demanding for large-scale integrated quantum photonics. However, the spectral purity of conventional microring resonators is limited to 93%, which impacts the quality of quantum interference within photonic circuits. The wavelength dependent coupling between ring and bus waveguides plays a significant role in the generation/heralding of single photons from the resonator. In this letter, we have presented a detailed investigation of the dispersive nature of relatively long directional couplers in order to design a microring resonator in all-pass configuration for chip-scale generation of single photons with maximum purity. In our studies, we have shown that a photon purity level close to 99% (λ ∼ 1550 nm) can be achieved by the use of a dispersive directional coupler in a race-track microring resonator in all-pass configuration, without affecting the photon heralding rate. The design parameters of the device are optimized such that it can be fabricated in commercial CMOS foundries.