Spatial dependence of output pulse delay in a niobium nitride nanowire superconducting single-photon detector

Published

May 16, 2011

Author(s)

Sae Woo Nam, J. A. O'Connor, Michael Tanner, C. M. Natarajan, G. S. Buller, R. J. Warburton, S Miki, Z. Wang, Robert Hadfield

Abstract

We report on the position-dependent variation in output pulse timing across a superconducting single- photon detector. Our device consists of a single niobium nitride nanowire meander (100 nm width, 4 nm film thickness, 2 mm length). We use a confocal microscope configuration (full width at half maximum- spot size 1.3 υm at 1550 nm wavelength) and a femtosecond laser to study local variations in detection efficiency and output pulse timing. Pulse delays of up to 50 ps across the device correlate to local detection efficiency and resistance variations. This study indicates an underlying mechanism for timing jitter in superconductingnanowire devices.

Citation

Applied Physics Letters

Volume

98

Issue

20

Pub Type

Journals

Download Paper

https://doi.org/10.1063/1.3581054

Keywords

superconductivity, single photon detectors, nanowire, jitter

Citation

Nam, S. , , J. , Tanner, M. , , C. , , G. , , R. , Miki, S. , Wang, Z. and Hadfield, R. (2011), Spatial dependence of output pulse delay in a niobium nitride nanowire superconducting single-photon detector, Applied Physics Letters, [online], https://doi.org/10.1063/1.3581054 (Accessed October 24, 2025)