Quantum frequency translation: efficient single-photon counting at 1.55 /spl mu/m

Alexander V. Sergienko

Marius A. Albotǎ, Franco N. C. Wong, Jeffrey H. Shapiro

We report polarization-independent upconversion from infrared to visible wavelengths. This technique enables high-efficiency continuous-wave photon counting at 1.55 /spl mu/m, and is necessary for quantum-state frequency translation and long-distance teleportation.

Franco N. C. Wong, Marius A. Albotǎ, Jeffrey H. Shapiro

We have achieved continuous-wave operation of efficient single-photon detection at 1.55 µm by sum-frequency mixing with a strong pump at 1064 nm in bulk periodically-poled lithium niobate followed by photon counting in the visible.

Marius A. Albotǎ, Franco N. C. Wong

Neil J. Savage

I. Rubtsova, Alexander A. Korneev, V. Marvienko +7 more

We have developed nanostructured NbN superconducting single-photon detectors capable of GHz-rate photon counting in the 0.4 to 5 /spl mu/m wavelength range. Quantum efficiency of 30%, dark count rate 3/spl times/10/sup -4/ s/sup -1/, and NEP=10/sup -20/ W/Hz/sup -1/2/ have been measured at the 1.3-/spl mu/m wavelength for the device operating at 2.0 K.