Operating quantum waveguide circuits with superconducting single-photon detectors

Natarajan, C.M., Peruzzo, A., Miki, S., Sasaki, M., Wang, Z., Baek, B., Nam, S., Hadfield, R.H. and O’Brien, J.L. (2010) Operating quantum waveguide circuits with superconducting single-photon detectors. Applied Physics Letters, 96(21), p. 211101. (doi: 10.1063/1.3413948)

Abstract

Advanced quantum information science and technology (QIST) applications place exacting demands on optical components. Quantum waveguide circuits offer a route to scalable QIST on a chip. Superconducting single-photon detectors (SSPDs) provide infrared single-photon sensitivity combined with low dark counts and picosecond timing resolution. In this study, we bring these two technologies together. Using SSPDs we observe a two-photon interference visibility of 92.3±1.0% in a silica-on-silicon waveguide directional coupler at λ = 804 nm—higher than that measured with silicon detectors (89.9±0.3%). We further operated controlled-NOT gate and quantum metrology circuits with SSPDs. These demonstrations present a clear path to telecom-wavelength quantum waveguide circuits.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hadfield, Professor Robert
• Authors: Natarajan, C.M., Peruzzo, A., Miki, S., Sasaki, M., Wang, Z., Baek, B., Nam, S., Hadfield, R.H., and O’Brien, J.L.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Applied Physics Letters
• ISSN: 0003-6951
• Published Online: 24 May 2010