期刊
APPLIED PHYSICS LETTERS
卷 96, 期 21, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3413948
关键词
directional couplers; elemental semiconductors; quantum computing; silicon radiation detectors; SQUIDs; superconducting photodetectors
资金
- EPSRC
- QIP IRC
- IARPA
- ERC
- Leverhulme Trust
- NSQI
- Royal Society
- EPSRC [EP/F010524/1, EP/F009968/1, EP/F008023/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F009968/1, EP/F008023/1, EP/F010524/1] Funding Source: researchfish
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 lambda=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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3413948]
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