Universal linear optics
Jacques Carolan,Chris Harrold,Chris Sparrow,Chris Sparrow,Enrique Martin-Lopez,Nicholas Russell,Joshua W. Silverstone,Peter Shadbolt,Nobuyuki Matsuda,Manabu Oguma,Mikitaka Itoh,Graham D. Marshall,Mark G. Thompson,Jonathan C. F. Matthews,Toshikazu Hashimoto,Jeremy L. O'Brien,Anthony Laing +16 more
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TLDR
In this paper, a sixmode universal system consisting of a cascade of 15 Mach-Zehnder interferometers with 30 thermo-optic phase shifters integrated into a single photonic chip was demonstrated.Abstract:
Linear optics underpins fundamental tests of quantum mechanics and quantum technologies. We demonstrate a single reprogrammable optical circuit that is sufficient to implement all possible linear optical protocols up to the size of that circuit. Our six-mode universal system consists of a cascade of 15 Mach-Zehnder interferometers with 30 thermo-optic phase shifters integrated into a single photonic chip that is electrically and optically interfaced for arbitrary setting of all phase shifters, input of up to six photons, and their measurement with a 12-single-photon detector system. We programmed this system to implement heralded quantum logic and entangling gates, boson sampling with verification tests, and six-dimensional complex Hadamards. We implemented 100 Haar random unitaries with an average fidelity of 0.999 ± 0.001. Our system can be rapidly reprogrammed to implement these and any other linear optical protocol, pointing the way to applications across fundamental science and quantum technologies.read more
Citations
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Quantum computational advantage using photons
Han-Sen Zhong,Hui Wang,Yu-Hao Deng,Ming-Cheng Chen,Li-Chao Peng,Yi-Han Luo,Jian Qin,Dian Wu,Xing Ding,Yi Hu,Peng Hu,Xiaoyan Yang,Weijun Zhang,Hao Li,Yuxuan Li,Xiao Jiang,Lin Gan,Guangwen Yang,Lixing You,Zhen Wang,Li Li,Nai-Le Liu,Chao-Yang Lu,Jian-Wei Pan +23 more
TL;DR: In this paper, the authors proposed to use quantum computers to perform certain tasks that are believed to be intractable to classical computers, such as Boson sampling, which is considered a strong candidate to demonstrate the capabilities of quantum computers.
Journal ArticleDOI
High-performance semiconductor quantum-dot single-photon sources.
TL;DR: The latest quantum dot-based single-Photon sources are edging closer to the ideal single-photon source, and have opened new possibilities for quantum technologies.
Journal ArticleDOI
Quantum computational supremacy
Aram W. Harrow,Ashley Montanaro +1 more
TL;DR: This work presents the leading proposals to achieve quantum supremacy, and discusses how to reliably compare the power of a classical computer to thePower of a quantum computer.
Journal ArticleDOI
Quantum computational advantage using photons
Han-Sen Zhong,Hui Wang,Yu-Hao Deng,Ming-Cheng Chen,Li-Chao Peng,Yi-Han Luo,Jian Qin,Dian Wu,Xing Ding,Yi Hu,Peng Hu,Xiaoyan Yang,Weijun Zhang,Hao Li,Yuxuan Li,Xiao Jiang,Lin Gan,Guangwen Yang,Lixing You,Zhen Wang,Li Li,Nai-Le Liu,Chao-Yang Lu,Jian-Wei Pan +23 more
TL;DR: Gaussian boson sampling was performed by sending 50 indistinguishable single-mode squeezed states into a 100-mode ultralow-loss interferometer with full connectivity and random matrix and sampling the output using 100 high-efficiency single-photon detectors, and the obtained samples were validated against plausible hypotheses exploiting thermal states, distinguishable photons, and uniform distribution.
Journal ArticleDOI
Integrated photonic quantum technologies
TL;DR: In this paper, the authors summarized 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.
References
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Calibration and high fidelity measurement of a quantum photonic chip
Hongwei Li,J. Wabnig,David Bitauld,Peter Shadbolt,Alberto Politi,Anthony Laing,Jeremy L. O'Brien,Antti O. Niskanen +7 more
TL;DR: In this article, an effective experimental calibration method based on Bayesian updating and Markov chain Monte Carlo integration was proposed to characterize a two qubit chip and extract the reflectivities of its directional couplers.