Abstract
We have experimentally implemented a narrow-linewidth source of greatly non-degenerate single photon pairs at the wavelengths of 894.6 nm (D1 transition line of cesium) and 1312.5 nm (telecommunications band). Based on spontaneous parametric down-conversion, the photon pairs are generated from a periodically poled lithium niobate crystal embedded in an optical cavity that is singly resonant for 894.6 nm. The cavity modes show a linewidth of 48 MHz and are separated by a large cavity free spectral range of 4.5 GHz. We use volume Bragg grating and sum-frequency-generation phase-matching filters to select a small number of modes in the signal and idler channel. The detected coincidence rate is 4.9 S−1 mW −1pump MHz −1SPDC from the resonant cavity modes. This source may actively interface between flying qubits in the 1310 nm telecommunications band and stationary qubits at the atomic wavelength of cesium for quantum repeater applications.
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The authors thank Dr. Yong-Su Kim for his help in the design of the cavity locking scheme.
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Slattery, O., Ma, L., Kuo, P. et al. Narrow-linewidth source of greatly non-degenerate photon pairs for quantum repeaters from a short singly resonant cavity. Appl. Phys. B 121, 413–419 (2015). https://doi.org/10.1007/s00340-015-6198-6
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DOI: https://doi.org/10.1007/s00340-015-6198-6