Superconducting nanowire single-photon detector with integrated impedance-matching taper
Name
1811.03991.pdf
Description
Submitted version
Size
2.04 MB
Format
Adobe PDF
Checksum (MD5)
5f15ccb8c74f14fdfc17bbe3dd781687
Author(s)
Zhu, Di
Colangelo, Marco
Korzh, Boris A.
Zhao, Qingyuan
Frasca, Simone
Dane, Andrew Edward
Velasco, Angel E.
Beyer, Andrew D.
Allmaras, Jason P.
Ramirez, Edward
Date Issued
January 2019
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Zhu, Di et al. "Superconducting nanowire single-photon detector with integrated impedance-matching taper." Applied Physics Letters 114 (January 2019): 22901 © 2019 Author(s)
Version
Original manuscript
Abstract
Conventional readout of a superconducting nanowire single-photon detector (SNSPD) sets an upper bound on the output voltage to be the product of the bias current and the load impedance, I B × Z load , where Z load is limited to 50 Ω in standard r.f. electronics. Here, we break this limit by interfacing the 50 Ω load and the SNSPD using an integrated superconducting transmission line taper. The taper is a transformer that effectively loads the SNSPD with high impedance without latching. At the expense of reduced maximum counting rate, it increases the amplitude of the detector output while preserving the fast rising edge. Using a taper with a starting width of 500 nm, we experimentally observed a 3.6× higher pulse amplitude, 3.7× faster slew rate, and 25.1 ps smaller timing jitter. The results match our numerical simulation, which incorporates both the hotspot dynamics in the SNSPD and the distributed nature in the transmission line taper. The taper studied here may become a useful tool to interface high-impedance superconducting nanowire devices to conventional low-impedance circuits.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.5080721
