期刊
LIGHT-SCIENCE & APPLICATIONS
卷 7, 期 -, 页码 -出版社
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2017.143
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资金
- Australian Research Council (ARC) [DP140100808, DP160100619]
- Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems (CUDOS)
- Centre of Excellence for Quantum Computation and Communication Technology [CE170100012]
- Griffith University Research Infrastructure Program
- Australian Government Research Training Program Scholarship
- Russian Ministry of Education and Science project [3.1365.2017/4.6]
Integrated photonics is a leading platform for quantum technologies including nonclassical state generation(1-4), demonstration of quantum computational complexity(5) and secure quantum communications(6). As photonic circuits grow in complexity, full quantum tomography becomes impractical, and therefore an efficient method for their characterization(7,8) is essential. Here we propose and demonstrate a fast, reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit. By establishing a rigorous correspondence between the generated quantum state and classical sum-frequency generation measurements from laser light, we overcome the limitations of previous approaches for lossy multimode devices(9,10). We applied this protocol to a multi-channel nonlinear waveguide network and measured a 99.28 +/- 0.31% fidelity between classical and quantum characterization. This technique enables fast and precise evaluation of nonlinear quantum photonic networks, a crucial step towards complex, large-scale, device production.
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