title: Absolute self-calibration of the quantum efficiency of single-photon detectors.
abstract: Single-photon detectors are finding increasingly wide application in all branches of science and technology thus a precise knowledge of their quantum efficiency is an essential prerequisite. We have performed the first proof-of-principle demonstration of a means to determine the quantum efficiency by which no second detector or reference standard is required. This absolute self-calibration method is based on the time correlation of entangled photons pairs emitted in spontaneous parametric down conversion. The measured quantum efficiency of a Si avalanche photodiode single-photon detector agrees well with the product specifications.
authors.affiliation: Laboratory of Optical Physics, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Xi-Hao
authors.initials: XH
authors.lastname: Chen
authors.forename: Yan-Hua
authors.initials: YH
authors.lastname: Zhai
authors.forename: Da
authors.initials: D
authors.lastname: Zhang
authors.forename: Ling-An
authors.initials: LA
authors.lastname: Wu