Fiber-coupled single-photon detectors based on NbN superconducting nanostructures for practical quantum cryptography and photon-correlation studies
- 26 June 2006
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 88 (26)
- https://doi.org/10.1063/1.2218105
Abstract
We have fabricated and tested a two-channel single-photon detector system based on two fiber-coupled superconducting single-photon detectors (SSPDs). Our best device reached the system quantum efficiency of 0.3% in the 1540-nm telecommunication wavelength with a fiber-to-detector coupling factor of about 30%. The photoresponse consisted of 2.5-ns-wide voltage pulses with a rise time of 250ps and timing jitter below 40ps. The overall system response time, measured as a second-order, photon cross-correlation function, was below 400ps. Our SSPDs operate at 4.2K inside a liquid-helium Dewar, but their optical fiber inputs and electrical outputs are at room temperature. Our two-channel detector system should find applications in practical quantum cryptography and in antibunching-type quantum correlation measurements.Keywords
This publication has 12 references indexed in Scilit:
- Fiber-coupled quantum-communications receiver based on two NbN superconducting single-photon detectorsPublished by SPIE-Intl Soc Optical Eng ,2005
- Ultrafast superconducting single‐photon detectors for near‐infrared‐wavelength quantum communicationsphysica status solidi (c), 2005
- Sensitivity and gigahertz counting performance of NbN superconducting single-photon detectorsApplied Physics Letters, 2004
- Demonstration of a low-noise near-infrared photon counter with multiphoton discriminationApplied Physics Letters, 2003
- Fabrication of nanostructured superconducting single-photon detectorsIEEE Transactions on Applied Superconductivity, 2003
- Noninvasive CMOS circuit testing with NbN superconducting single-photon detectorsElectronics Letters, 2003
- Long-distance free-space quantum cryptographyPublished by SPIE-Intl Soc Optical Eng ,2002
- Detection efficiency of large-active-area NbN single-photon superconducting detectors in the ultraviolet to near-infrared rangeApplied Physics Letters, 2002
- Picosecond superconducting single-photon optical detectorApplied Physics Letters, 2001
- High-data-rate systems for space applicationsPublished by SPIE-Intl Soc Optical Eng ,1995