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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Journal ArticleDOI
Coherent nonlinear optics of quantum emitters in nanophotonic waveguides
Pierre Türschmann,Hanna Le Jeannic,Signe F. Simonsen,Harald R. Haakh,Stephan Götzinger,Stephan Götzinger,Vahid Sandoghdar,Peter Lodahl,Nir Rotenberg +8 more
TL;DR: In this article, the authors review progress towards coherent light-matter interactions with solid-state quantum emitters coupled to nanophotonic waveguides and highlight protocols for applications and novel effects that are based on these coherent interactions, the steps taken towards their realization and the challenges that remain to be overcome.
Quantum Commuting Circuits and Complexity of Ising Partition Functions
Keisuke Fujii,Tomoyuki Morimae +1 more
TL;DR: It is shown that there is no fully polynomial randomized approximation scheme (FPRAS) for Ising models with almost all imaginary coupling constants even on a planar graph of a bounded degree, unless the PH collapses at the third level.
Journal ArticleDOI
Implementing graph-theoretic quantum algorithms on a silicon photonic quantum walk processor
Xiaogang Qiang,Yi-Zhi Wang,Shichuan Xue,Renyou Ge,Lifeng Chen,Yingwen Liu,Anqi Huang,Xiang Fu,Ping Xu,Teng Yi,Fufang Xu,Mingtang Deng,Jingbo Wang,Jasmin D. A. Meinecke,Jasmin D. A. Meinecke,Jonathan C. F. Matthews,Xinlun Cai,Xuejun Yang,Junjie Wu +18 more
TL;DR: In this article, the authors propose a quantum walk algorithm for searching vertices in graphs and testing for graph isomorphisms using a single-photon quantum walker with quantum entanglement.
Journal ArticleDOI
Photon-Pair Generation with a 100 nm Thick Carbon Nanotube Film
Kim Fook Lee,Ying Tian,Ying Tian,He Yang,Kimmo Mustonen,Amos Martinez,Qing Dai,Esko I. Kauppinen,John Malowicki,Prem Kumar,Zhipei Sun +10 more
TL;DR: Coll correlated photon pairs are generated in the nanometer scale using a nonlinear optical device for the first time and are promising for future integrated nonlinear quantum devices (e.g., quantum emission and processing devices).
Journal ArticleDOI
Measurement-Based Entanglement of Noninteracting Bosonic Atoms.
Brian Lester,Yiheng Lin,Mark O. Brown,Adam Kaufman,Randall J. Ball,Emanuel Knill,Emanuel Knill,Ana Maria Rey,Ana Maria Rey,Cindy Regal +9 more
TL;DR: In this article, Hong-Ou-Mandel interference was used to postselect a spin-singlet state after overlapping two atoms in distinct spin states on an effective beam splitter.
References
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Book
Quantum Computation and Quantum Information
TL;DR: In this article, the quantum Fourier transform and its application in quantum information theory is discussed, and distance measures for quantum information are defined. And quantum error-correction and entropy and information are discussed.
Quantum Computation and Quantum Information
TL;DR: This chapter discusses quantum information theory, public-key cryptography and the RSA cryptosystem, and the proof of Lieb's theorem.
Journal ArticleDOI
A scheme for efficient quantum computation with linear optics.
TL;DR: It is shown that efficient quantum computation is possible using only beam splitters, phase shifters, single photon sources and photo-detectors and are robust against errors from photon loss and detector inefficiency.
Journal ArticleDOI
Measurement of subpicosecond time intervals between two photons by interference.
TL;DR: A fourth-order interference technique has been used to measure the time intervals between two photons, and by implication the length of the photon wave packet, produced in the process of parametric down-conversion.