Superconducting nanowire single-photon detector with integrated impedance-matching taper

@article{Zhu2019SuperconductingNS,
  title={Superconducting nanowire single-photon detector with integrated impedance-matching taper},
  author={Di Zhu and Marco Colangelo and Boris A. Korzh and Qingyuan Zhao and Simone Frasca and Andrew E. Dane and Angel Enriques Velasco and Andrew D. Beyer and Jason P. Allmaras and Edward Ramirez and William J. Strickland and Daniel F. Santavicca and Matthew D. Shaw and Karl K. Berggren},
  journal={Applied Physics Letters},
  year={2019}
}
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, $I_\mathrm{B}\times Z_\mathrm{load}$, where $Z_\mathrm{load}$ is limited to 50 $\Omega$ in standard r.f. electronics. Here, we break this limit by interfacing the 50 $\Omega$ load and the SNSPD using an integrated superconducting transmission line taper. The taper is a transformer that effectively loads the… 

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