title: Counting rate enhancements in superconducting nanowire single-photon detectors with improved readout circuits.
abstract: Counting rates of superconducting nanowire single-photon detectors are usually estimated at hundreds of MHz by their kinetic-inductive reset time. This maximum is also limited by capacitor coupling effects in conventional readout circuits. In this Letter, we design and demonstrate an improved readout circuit that reduces the reset time and removes circuit limits. The counting rate at the 3 dB compression point is increased by four times for a large active area detector. We also discuss nonlinear dependences of the counting rate on the incident continuous-wave optical power and give a numerical model to explain our observations.
authors.forename: Qingyuan
authors.initials: Q
authors.lastname: Zhao
authors.forename: Tao
authors.initials: T
authors.lastname: Jia
authors.forename: Min
authors.initials: M
authors.lastname: Gu
authors.forename: Chao
authors.initials: C
authors.lastname: Wan
authors.forename: Labao
authors.initials: L
authors.lastname: Zhang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Xu
authors.forename: Lin
authors.initials: L
authors.lastname: Kang
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Peiheng
authors.initials: P
authors.lastname: Wu