An efficient, tunable, and robust source of narrow-band photon pairs at the 87Rb D1 line.

@article{Mottola2020AnET,
  title={An efficient, tunable, and robust source of narrow-band photon pairs at the 87Rb D1 line.},
  author={Roberto Mottola and Gianni Buser and Chris Müller and Tim Kroh and Andreas Ahlrichs and Sven Ramelow and Oliver Benson and Philipp Treutlein and Janik Wolters},
  journal={Optics express},
  year={2020},
  volume={28 3},
  pages={
          3159-3170
        }
}
We present an efficient and robust source of photons at the 87Rb D1-line (795 nm) with a narrow bandwidth of δ = 226(1) MHz. The source is based on non-degenerate, cavity-enhanced spontaneous parametric down-conversion in a monolithic optical parametric oscillator far below threshold. The setup allows for efficient coupling to single mode fibers. A heralding efficiency of ηheralded = 45(5) % is achieved, and the uncorrected number of detected photon pairs is 3.8 × 103/(s mW). For pair… 
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