Frequency Conversion of Narrowband Single Photons from a SPDC Pair Source
Andreas Lenhard, Stephan Kucera, José Luis Saquinaula Brito, Jürgen Eschner, Christoph Becher · 2014
We report on frequency down conversion of single photons from a photon pair source resonant with an atomic transition of Calcium ions. The temporal correlation between the photon pair is preserved in the conversion process.