Readout Circuit Based on Single-Flux-Quantum Logic Circuit for Photon-Number-Resolving SNSPD Array

A read-out circuit for photon-number-resolving superconducting nanowire single-photon detector (SNSPD) based on the single-flux-quantum (SFQ) circuit was designed and the basic performance of the fabricated circuit was confirmed. The current pulse output from an SNSPD array was converted to a SFQ pu...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2018-06, Vol.28 (4), p.1-4
Main Authors: Myoren, Hiroaki, Denda, Satoshi, Ota, Kazuki, Naruse, Masato, Taino, Tohru, Kang, Lin, Chen, Jian, Wu, Peiheng
Format: Article
Language:English
Subjects:
Detectors
Logic arrays
photon-number resolving detector
Photonics
RLC circuits
single-flux-quantum logic circuit
Superconducting nanowire single photon detector
Superconductivity
Voltage measurement
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Summary:A read-out circuit for photon-number-resolving superconducting nanowire single-photon detector (SNSPD) based on the single-flux-quantum (SFQ) circuit was designed and the basic performance of the fabricated circuit was confirmed. The current pulse output from an SNSPD array was converted to a SFQ pulse. The SFQ pulse triggered two stacks of double-flux-quantum (DFQ) amplifiers. A single block of a 40-series DFQ amplifier (DFQA) generated 2.3-mV voltage with a rising time of 400 ps for an operation frequency of 1.25 GHz, and the two stacks of DFQA generated 4.6-mV voltage when the SFQ pulse trains supplied both the DFQAs. The total voltage generated by twelve-series of 40-series DFQAs was expected to be 27.6 mV, with the same rising time of 400 ps. Using the fabricated circuit, the 40-series DFQA and the two stacks of the 40-series DFQA generated 2.3- and 4.6-mV voltage, respectively. The output voltage of the SFQ readout circuit was compatible to a room-temperature photon counter with a wide-band low-noise amplifier operating at low temperature.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2809483