Fig. 3: Characterization of MgB2 nanowire detector
From: Quantum light detection in high-temperature superconducting nanowires
a Image of the MgB2 nanowire on a SiC substrate (note, the negative e-beam resist remains on the top). b Free-space optical setup including a femtosecond 785 nm laser, beamsplitter (BS), mirror (M), calibrated attenuators (A), lens (L), and a cryostat with an optical window. c Pulse detection probability of the MgB2 nanowire in response to mean photon number μ at the detector area for different bias currents Ibias indicated (the error bars are based on Poisson errors of measured count rates). Markers: measured data; curves: model fits using eq. (3) with the number of detector elements M = 773 fixed, the best-fit threshold width δU = 1.6 eV, and the best-fit current-dependent threshold energy U0(Ibias), shown in the inset.
