2017/03/07 by Francesco Lenzini, Alexander N Poddubny, Alexander N. Poddubny +12 · 1 citation
Computer Science · Physics and Astronomy · #Laser #Neural Networks and Reservoir Computing #Nonclassical light #Nonlinear system #Photonics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum imaging #Quantum optics #Quantum technology #Quantum tomography #physics.optics #quant-ph
paper · pdf · doi:10.1038/lsa.2017.143
published as Light: Science & Applications 7, 17143 (2018)
arxiv created 2017/03/07 · openalex created_date 2017/03/16 · openalex publication_date 2018/01/12 · arxiv updated 2018/04/12 · openalex updated_date 2026/08/05
Abstract Integrated photonics is a leading platform for quantum technologies including nonclassical state generation 1, 2, 3, 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 multi-mode 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.