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Shaping the response pulse of superconducting nanowire single photon detection with a snubber

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2 Author(s)
You, L.X. ; State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), CAS, Shanghai 200050, People''s Republic of China ; Shen, X.F.

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Unavoidable kinetic inductance of the superconducting nanowire single photon detector results in the signal pulse with a slow falling edge and a large pulse width. It has been a limit for improving the repetition rate for single photon detection. With a snubber made of a coaxial cable terminated with a resistive pot, the original signal pulse can be shaped. A sharp falling edge can be produced with suitable snubber parameters and the final output pulse has a symmetric wave. The pulse width (full width at half maximum) is reduced from 5 to 1 ns.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 15 )