Narrow linewidth source of greatly non-degenerate photon pairs for quantum repeaters from a short singly-resonant cavity
Oliver T. Slattery, Paulina S. Kuo, Lijun Ma, Xiao Tang
Quantum repeaters require entangled photon pair sources to connect flying qubits in the telecommunication band and stationary qubits at atomic transition wavelengths and linewidths for quantum memories. We have experimentally implemented a narrow linewidth source of greatly non-degenerate single photon pairs at the strategic wavelengths of 894.6 nm (D1 transition line of cesium) and 1312.5 nm (telecommunications band). Based on Spontaneous Parametric Down- Conversion (SPDC), the photon pairs are generated from a periodically poled lithium niobate (PPLN) crystal embedded in a singly-resonant optical cavity for 894.6 nm. The cavity modes show a linewidth of approximately 48 MHz and separated by a large cavity free spectral range of approximately 4.5 GHz. We use volume Bragg grating (VBG) and a sum frequency generation (SFG) phase matching filters to efficiently select a small number of modes. The detected coincidence rate is nearly 4.9 S-1 mW-1pump MHz-1SPDC from the resonant cavity modes compared to 5.2X10-2 S-1 mW-1pump MHz-1SPDC for the single pass case.
, Kuo, P.
, Ma, L.
and Tang, X.
Narrow linewidth source of greatly non-degenerate photon pairs for quantum repeaters from a short singly-resonant cavity, Applied Physics B-Lasers and Optics, [online], https://doi.org/10.1007/s00340-015-6198-6
(Accessed December 1, 2021)