Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Operating quantum waveguide circuits with superconducting single-photon detectors



C. M. Natarajan, A. Peruzzo, Shigehito Miki, Masahide Sasaki, Z. Wang, Burm Baek, Sae Woo Nam, Robert Hadfield, Jeremy L. O'Brien


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.
Applied Physics Letters


superconducting nanowire single photon detector, optical waveguide, photonic quantum circuit


Natarajan, C. , Peruzzo, A. , Miki, S. , Sasaki, M. , Wang, Z. , Baek, B. , Nam, S. , Hadfield, R. and O'Brien, J. (2010), Operating quantum waveguide circuits with superconducting single-photon detectors, Applied Physics Letters, [online], (Accessed April 14, 2024)
Created May 23, 2010, Updated October 12, 2021