Frequency tuning of a triply-resonant whispering-gallery mode resonator to MHz wide transitions for proposed quantum repeater schemes
arXiv:1510.01198 · doi:10.1080/09500340.2016.1148211
Abstract
Quantum repeaters rely on an interfacing of flying qubits with quantum memories. The most common implementations include a narrowband single photon matched in bandwidth and central frequency to an atomic system. Previously, we demonstrated the compatibility of our versatile source of heralded single photons, which is based on parametric down-conversion in a triply-resonant whispering-gallery mode resonator, with alkaline transitions [Schunk et al., Optica 2, 773 (2015)]. In this paper, we analyze our source in terms of phase matching, available wavelength-tuning mechanisms, and applications to narrow-band atomic systems. We resonantly address the D1 transitions of cesium and rubidium with this optical parametric oscillator pumped above its oscillation threshold. Below threshold, the efficient coupling of single photons to atomic transitions heralded by single telecom-band photons is demonstrated. Finally, we present an accurate analytical description of our observations. Providing the demonstrated flexibility in connecting various atomic transitions with telecom wavelengths, we show a promising approach to realize an essential building block for quantum repeaters.
18 pages, 14 figures
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- Nonlinear and Quantum Optics with Whispering Gallery Resonators
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- Dielectric tuning and coupling of whispering gallery modes using an anisotropic prism
- An efficient, tunable, and robust source of narrow-band photon pairs at the Rb D1 line
- Nonlinear power dependence of the spectral properties of an optical parametric oscillator below threshold in the quantum regime
- Characterization of a photon pair source based on a cold atomic ensemble using a cascade level scheme
- Unfolding the Hong-Ou-Mandel interference between heralded photons from narrowband twin beams
- Off-resonant emission of photon pairs in nonlinear optical cavities