Quantum detector tomography of a single-photon frequency upconversion detection system Ma, Jianhui ; Chen, Xiuliang ; Hu, Huiqin ; Pan, Haifeng ; Wu, E. ; Zeng, Heping Abstract Publication: Optics Express Pub Date: September 2016 DOI: 10.1364/OE.24.020973 Bibcode: 2016OExpr..2420973M