中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57401-057401.doi: 10.1088/1674-1056/ac398a
Hou-Rong Zhou(周后荣)1,2, Kun-Jie Cheng(程昆杰)1,2, Jie Ren(任洁)1,2,3,†, Li-Xing You(尤立星)1,2,3,‡, Li-Liang Ying(应利良)1,3, Xiao-Yan Yang(杨晓燕)1,3, Hao Li(李浩)1,3, and Zhen Wang(王镇)1,3
Hou-Rong Zhou(周后荣)1,2, Kun-Jie Cheng(程昆杰)1,2, Jie Ren(任洁)1,2,3,†, Li-Xing You(尤立星)1,2,3,‡, Li-Liang Ying(应利良)1,3, Xiao-Yan Yang(杨晓燕)1,3, Hao Li(李浩)1,3, and Zhen Wang(王镇)1,3
摘要: Superconducting nanowire single-photon detectors (SNSPDs) are typical switching devices capable of detecting single photons with almost 100% detection efficiency. However, they cannot determine the exact number of incident photons during a detection event. Multi-pixel SNSPDs employing multiple read-out channels can provide photon number resolvability (PNR), but they require increased cooling power and costly multi-channel electronic systems. In this work, a single-flux quantum (SFQ) circuit is employed, and PNR based on multi-pixel SNSPDs is successfully demonstrated. A multi-input magnetically coupled DC/SFQ converter (MMD2Q) circuit with a mutual inductance M is used to combine and record signals from a multi-pixel SNSPD device. The designed circuit is capable of discriminating the amplitude of the combined signals in accuracy of Φ0/M with Φ0 being a single magnetic flux quantum. By employing the MMD2Q circuit, the discrimination of up to 40 photons can be simulated. A 4-parallel-input MMD2Q circuit is fabricated, and a PNR of 3 is successfully demonstrated for an SNSPD array with one channel reserved for the functional verification. The results confirm that an MMD2Q circuit is an effective tool for implementing PNR with multi-pixel SNSPDs.
中图分类号: (Thermoelectric effects)