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

J. A. O'Connor, M. G. Tanner, C. M. Natarajan, G. S. Buller, R. J. Warburton, S. Miki, Z. Wang, S. W. Nam, R. H. Hadfield

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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 mu;m 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 superconducting nanowire devices. © 2011 American Institute of Physics.

Original languageEnglish
Article number201116
JournalApplied Physics Letters
Volume98
Issue number20
DOIs
Publication statusPublished - 16 May 2011

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    O'Connor, J. A., Tanner, M. G., Natarajan, C. M., Buller, G. S., Warburton, R. J., Miki, S., Wang, Z., Nam, S. W., & Hadfield, R. H. (2011). Spatial dependence of output pulse delay in a niobium nitride nanowire superconducting single-photon detector. Applied Physics Letters, 98(20), [201116]. https://doi.org/10.1063/1.3581054