NIST logo

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

NIST Authors in Bold

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;
Title: Spatial dependence of output pulse delay in a niobium nitride nanowire superconducting single-photon detector
Published: May 16, 2011
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
Pages: 3 pp.
Keywords: superconductivity; single photon detectors; nanowire; jitter
Research Areas: Optoelectronics
DOI: http://dx.doi.org/10.1063/1.3581054  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)