A tunable narrowband entangled photon pair source for resonant single-photon single-atom interaction
Albrecht Haase, Nicolas Piro, J\"urgen Eschner, and Morgan W. Mitchell
TL;DR
This paper introduces a tunable, narrow-bandwidth entangled photon pair source based on SPDC in PPKTP, capable of resonantly interacting with calcium ion transitions at 850 and 854 nm.
Contribution
It provides a frequency-stabilized, narrow-band entangled photon source tailored for single-atom experiments, with precise wavelength tuning and bandwidth matching calcium ion absorption.
Findings
Wavelength stabilization at 850 and 854 nm.
Bandwidth of 22 MHz matches calcium ion absorption.
Spectral power density of 1.0 pairs/(s MHz mW).
Abstract
We present a tunable, frequency-stabilized, narrow-bandwidth source of frequency-degenerate, entangled photon pairs. The source is based on spontaneous parametric downconversion (SPDC) in periodically-poled KTiOPO4 (PPKTP). Its wavelength can be stabilized to 850 or 854 nm, thus allowing to address two D-P transitions in 40Ca+ ions. Its output bandwidth of 22 MHz coincides with the absorption bandwidth of the calcium ions. Its spectral power density is 1.0 generated pairs/(s MHz mW).
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