Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Coherent quantum frequency bridge: phase preserving, nearly-noiseless parametric frequency converter



Ivan A. Burenkov, Yu-Hsiang Cheng, Tim O. Thomay, Glenn S. Solomon, Alan L. Migdall, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Lynden K. Shalm, Sergey V. Polyakov


We characterize an efficient and nearly-noiseless parametric frequency upconverter. The ultra- low noise regime is reached by the wide spectral separation between the input and pump frequencies and the low pump frequency relative to the input photons. The background of only $\approx$100 photons per hour is demonstrated. We demonstrate phase preservation in a frequency upconversion process at the single-photon level. We summarize our efforts to measure this ultra-low noise level, and discuss both single-photon avalanche photodiode measurements and a photon-counting transition edge sensor (TES) measurements. To reach the required accuracy, we supplemented our TES with a dark count reduction algorithm. The preservation of the coherence was demonstrated by simultaneously upconverting the input of each arm of a Mach-Zehnder interferometer through high interference fringe contrast. We observe fringe visibilities of $\geq0.97$ with faint coherent input.
Proceedings of SPIE Defense and Security Symposium


hybrid quantum system, ultra-low light measurements, single photon detector, parametric upcon- version, statistical analysis


Burenkov, I. , Cheng, Y. , Thomay, T. , Solomon, G. , Migdall, A. , Gerrits, T. , Lita, A. , Nam, S. , Shalm, L. and Polyakov, S. (2017), Coherent quantum frequency bridge: phase preserving, nearly-noiseless parametric frequency converter, Proceedings of SPIE Defense and Security Symposium, [online], (Accessed May 25, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created May 3, 2017, Updated November 10, 2018