Quantum technologies comprise an emerging class of devices capable of controlling superposition and entanglement of quantum states of light or matter, to realize fundamental performance advantages over ordinary classical machines. The technology of integrated quantum photonics has enabled the generation, processing and detection of quantum states of light at a steadily increasing scale and level of complexity, progressing from few-component circuitry occupying centimetre-scale footprints and operating on two photons, to programmable devices approaching 1,000 components occupying millimetre-scale footprints with integrated generation of multiphoton states. This Review summarizes the advances in integrated photonic quantum technologies and its demonstrated applications, including quantum communications, simulations of quantum chemical and physical systems, sampling algorithms, and linear-optic quantum information processing.
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We thank C.-Y. Lu for discussions on quantum dot sources and J. Bulmer for discussions on photonic quantum information processing. J.W. acknowledges support from the Natural Science Foundation of China (61975001), National Key Research & Development (R&D) Program of China (2018YFB1107205), Beijing Natural Science Foundation (Z190005), Beijing Academy of Quantum Information Sciences (Y18G21) and the Key R&D Program of Guangdong Province (2018B030329001). F.S. acknowledges support from the H2020-FETPROACT-2014 Grant QUCHIP (Quantum Simulation on a Photonic Chip; grant agreement no. 641039). A.L. acknowledges support from an EPSRC (Engineering and Physical Sciences Research Council) Early Career Fellowship EP/N003470/1. M.G.T. acknowledges support from an ERC (European Research Council) starter grant (ERC-2014-STG 640079) and an EPSRC Early Career Fellowship (EP/K033085/1).
M.T. is involved in developing quantum photonic technologies at PsiQuantum Corporation.
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Wang, J., Sciarrino, F., Laing, A. et al. Integrated photonic quantum technologies. Nat. Photonics 14, 273–284 (2020). https://doi.org/10.1038/s41566-019-0532-1
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