Statistically background-free, phase-preserving parametric up-conversion with faint light
Yu-Hsiang Cheng, Tim O. Thomay, Glenn S. Solomon, Alan L. Migdall, Sergey Polyakov
We demonstrate phase preservation in a frequency up-conversion process at the single-photon level. This phase preservation enables the applications of frequency conversion of entangled photon pairs. Periodically poled lithium niobate waveguides and a 1550 nm pump laser are employed to convert near infrared 920 nm photons into the visible at 577 nm. Using a Mach-Zehnder interferometer, whose input wavelengths differ from the output, fringe visibilities of >=0.97 were observed. Within the available range of pump power and up-conversion efficiency, no statistically significant background photons near the up-converted wavelength due to the strong pump were detected in our experimental setup.
, Thomay, T.
, Solomon, G.
, Migdall, A.
and Polyakov, S.
Statistically background-free, phase-preserving parametric up-conversion with faint light, Optics Express, [online], https://doi.org/10.1364/OE.23.018671, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917762
(Accessed December 2, 2023)