Physical mechanisms of timing jitter in photon detection by current-carrying superconducting nanowires
Mariia Sidorova, Alexej Semenov, Heinz-Wilhelm Hübers, Ilya Charaev, Artem Kuzmin, Steffen Doerner, Michael Siegel
DOI 10.1103/PhysRevB.96.184504 · Physical Review B
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Abstract
We studied timing jitter in the appearance of photon counts in meandering nanowires with different fractional amount of bends. Intrinsic timing jitter, which is the probability density function of the random time delay between photon absorption in current-carrying superconducting nanowire and appearance of the normal domain, reveals two different underlying physical mechanisms. In the deterministic regime, which is realized at large photon energies and large currents, jitter is controlled by position-dependent detection threshold in straight parts of meanders. It decreases with the increase in the current. At small photon energies, jitter increases and its current dependence disappears. In this probabilistic regime jitter is controlled by Poisson process in that magnetic vortices jump randomly across the wire in areas adjacent to the bends.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.05 | Pressure not reported | onset |
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