An efficient, tunable, and robust source of narrow-band photon pairs at the 87Rb D1 line
Journalartikel
Details zur Publikation
Autor*innen: Motolla R, Buser G, Müller C, Kroh T, Ahlrichs A, Ramelow S, Benson O, Treutlein P, Wolters J
Zeitschrift: Optics Express
Jahr der Veröffentlichung: 2020
Bandnummer: 28
Heftnummer: 3
Verlag: Optical Society of America
ISSN: 1094-4087
Beschreibung
We present an efficient and robust source of photons at the 87Rb D1-line (795 nm) with a narrow bandwidth of $\delta${\hspace{0.167em}}}={\hspace{0.167em}}}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 $η$heralded{\hspace{0.167em}}}={\hspace{0.167em}}}45(5) \% is achieved, and the uncorrected number of detected photon pairs is 3.8{\hspace{0.167em}}}{\texttimes}{\hspace{0.167em}}}103/(s mW). For pair generation rates up to 5{\hspace{0.167em}}}{\texttimes}{\hspace{0.167em}}}105/s, the source emits heralded single photons with a normalized, heralded, second-order correlation function $\mathslg$(2)$\mathslc$<0.01. The source is intrinsically stable due to the monolithic configuration. Frequency drifts are on the order of $\delta$/20 per hour without active feedback on the emission frequency. We achieved fine-tuning of the source frequency within a range of >2 GHz by applying mechanical strain.
