21 May 2015 High spectral purity silicon ring resonator photon-pair source
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Here we present the experimental demonstration of a Silicon ring resonator photon-pair source. The crystalline Silicon ring resonator (radius of 18.5μm) was designed to realize low dispersion across multiple resonances, which allows for operation with a high quality factor of Q~50k. In turn, the source exhibits very high brightness of >3x105 photons/s/mW2/GHz since the produced photon pairs have a very narrow bandwidth. Furthermore, the waveguidefiber coupling loss was minimized to <1.5dB using an inverse tapered waveguide (tip width of ~150nm over a 300μm length) that is butt-coupled to a high-NA fiber (Nufern UHNA-7). This ensured minimal loss of photon pairs to the detectors, which enabled very high purity photon pairs with minimal noise, as exhibited by a very high Coincidental-Accidental Ratio of >1900. The low coupling loss (3dB fiber-fiber) also allowed for operation with very low off-chip pump power of <200μW. In addition, the zero dispersion of the ring resonator resulted in the production of a photon-pair comb across multiple resonances symmetric about the pump resonance (every ~5nm spanning >20nm), which could be used in future wavelength division multiplexed quantum networks.
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Jeffrey A. Steidle, Jeffrey A. Steidle, Michael L. Fanto, Michael L. Fanto, Christopher C. Tison, Christopher C. Tison, Zihao Wang, Zihao Wang, Stefan F. Preble, Stefan F. Preble, Paul M. Alsing, Paul M. Alsing, "High spectral purity silicon ring resonator photon-pair source", Proc. SPIE 9500, Quantum Information and Computation XIII, 950015 (21 May 2015); doi: 10.1117/12.2177179; https://doi.org/10.1117/12.2177179

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