Superconducting nanowire single-photon detectors with 98% system detection efficiency at 1550 nm
Dileep Reddy, Robert R. Nerem, Sae Woo Nam, Richard Mirin, Varun Verma
Superconducting nanowire single-photon detectors (SNSPDs) are an enabling technology for a myriad of quantum-optics experiments that require high-efficiency detection, large count rates, and precise timing resolution. The system detection efficiency (SDE) for fiber-coupled SNSPDs have fallen short of theoretical predictions by at least 7%, with the discrepancy being attributed to scattering, material absorption, and other SNSPD dynamics. We optimize the design and fabrication of an all-dielectric layered stack and fiber coupling package in order to achieve 98.0 +/- 0.5% SDE for single-mode-fiber guided photons derived from a highly-attenuated 1550 nm continuous-wave laser. This enforces a smaller bound on the scattering and absorption losses in such systems and opens the use of SNSPDs for multi-photon coincident event scenarios which demand high-SDE for throughput and fidelity.
, Nerem, R.
, Nam, S.
, Mirin, R.
and Verma, V.
Superconducting nanowire single-photon detectors with 98% system detection efficiency at 1550 nm, Optica, [online], https://doi.org/10.1364/OPTICA.400751
(Accessed June 5, 2023)