Crosstalk-free operation of multi-element SSPD array integrated with SFQ circuit in a 0.1 Watt GM cryocooler

TL;DR

This paper reports the successful integration and operation of a multi-element superconducting nanowire single-photon detector array with an SFQ readout circuit in a compact cryocooler, demonstrating crosstalk-free performance and comparable efficiency to single-pixel systems.

Contribution

It introduces a novel integration of a multi-element SSPD array with SFQ readout in a compact cryocooler, achieving crosstalk-free operation and high timing precision.

Findings

Crosstalk-free operation of the SSPD array confirmed by time-resolved readout.

Timing jitter of 50 ps measured, comparable to single-pixel systems.

System detection efficiency of 11.4% achieved in the integrated setup.

Abstract

We demonstrate the successful operation of a multi-element superconducting nanowire single-photon detector (SSPD) array integrated with a single-flux-quantum (SFQ) readout circuit in a compact 0.1 W Gifford-McMahon cryocooler. A time-resolved readout technique, where output signals from each element enter the SFQ readout circuit with finite time intervals, revealed crosstalk-free operation of the four-element SSPD array connected with the SFQ readout circuit. The timing jitter and the system detection efficiency were measured to be 50 ps and 11.4%, respectively, which were comparable to the performance of practical single-pixel SSPD systems.