title: Long-wavelength-pumped upconversion single-photon detector at 1550 nm: performance and noise analysis.
abstract: We demonstrate upconversion-assisted single-photon detection for the 1.55-μm telecommunications band based on a periodically poled lithium niobate (PPLN) waveguide pumped by a monolithic PPLN optical parametric oscillator. We achieve an internal conversion efficiency of 86%, which results in an overall system detection efficiency of 37%, with excess noise as low as 10(3) counts s(-1). We measure the dark count rate versus the upconversion pump-signal frequency separation and find the results to be consistent with noise photon generation by spontaneous anti-Stokes Raman scattering. These results enable detailed design guidelines for the development of low-noise quantum frequency conversion systems, which will be an important component of fiber-optic quantum networks.
authors: E. L. Ginzton Laboratory, Stanford University, Stanford, California, USA. jpelc@stanford.edu
authors: J S
authors: JS
authors: Pelc
authors: L
authors: L
authors: Ma
authors: C R
authors: CR
authors: Phillips
authors: Q
authors: Q
authors: Zhang
authors: C
authors: C
authors: Langrock
authors: O
authors: O
authors: Slattery
authors: X
authors: X
authors: Tang
authors: M M
authors: MM
authors: Fejer