title: Photon-number-resolving detection at 1.04 μm via coincidence frequency upconversion.
abstract: We demonstrate photon-number-resolving detection based on coincidence frequency upconversion. Pumped by synchronized pulses, the photon signal of the coherent state at 1.04 μm was upconverted into visible replicas with preserved photon number distribution. The upconverted photons were then registered by a silicon multipixel photon counter. The photon-number-resolving performance was improved by reducing the background counts with a synchronous pump as the coincidence gate and reducing the intrinsic parametric fluorescence influence with long-wavelength pumping. A total detection efficiency of 3.7% was achieved with a quite low noise probability per pulse of 0.0002.
authors.affiliation: State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Huang
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Gu
authors.forename: Min
authors.initials: M
authors.lastname: Ren
authors.forename: Yi
authors.initials: Y
authors.lastname: Jian
authors.forename: Haifeng
authors.initials: H
authors.lastname: Pan
authors.forename: Guang
authors.initials: G
authors.lastname: Wu
authors.forename: E
authors.initials: E
authors.lastname: Wu
authors.forename: Heping
authors.initials: H
authors.lastname: Zeng