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
Universal fault-tolerant measurement-based quantum computation
Benjamin J. Brown,Sam Roberts +1 more
TL;DR: A framework to map fault-tolerant procedures for quantum computation that have been natively designed for use with stabilizer codes onto a measurement-based protocol, allowing for a new model of universal quantum computation based on the braiding and fusion of foliated topological defects that are akin to Majorana modes.
Journal ArticleDOI
On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source
Ravitej Uppu,Hans T. Eriksen,Henri Thyrrestrup,Aslı D. Uğurlu,Ying Wang,Sven Scholz,Andreas D. Wieck,Arne Ludwig,Matthias C. Löbl,Richard J. Warburton,Peter Lodahl,Leonardo Midolo +11 more
TL;DR: A coherent and stable single-photon source that simultaneously achieves high-purity, high-indistinguishability, and >80% coupling efficiency into the waveguide, integrated with on-chip optical networks implementing photonic quantum processors.
Journal ArticleDOI
Benchmarking integrated photonic architectures
Fulvio Flamini,Nicolò Spagnolo,Niko Viggianiello,Andrea Crespi,Roberto Osellame,Fabio Sciarrino +5 more
Abstract: Photonic platforms represent a promising technology for the realization of several quantum communication protocols and for experiments of quantum simulation. Moreover, large-scale integrated interferometers have recently gained a relevant role for restricted models of quantum computing, specifically with Boson Sampling devices. Indeed, various linear optical schemes have been proposed for the implementation of unitary transformations, each one suitable for a specific task. Notwithstanding, so far a comprehensive analysis of the state of the art under broader and realistic conditions is still lacking. In the present work we address this gap, providing in a unified framework a quantitative comparison of the three main photonic architectures, namely the ones with triangular and square designs and the so-called fast transformations. All layouts have been analyzed in presence of losses and imperfect control over the reflectivities and phases of the inner structure. Our results represent a further step ahead towards the implementation of quantum information protocols on large-scale integrated photonic devices.
Patent
Apparatus and methods for optical neural network
Jacques Carolan,Mihika Prabhu,Scott Skirlo,Yichen Shen,Marin Soljacic,Nicholas C. Harris,Dirk Englund +6 more
TL;DR: In this article, an optical neural network is constructed based on photonic integrated circuits to perform neuromorphic computing, where matrix multiplication is implemented using one or more optical interference units, which can apply an arbitrary weighting matrix multiplication to an array of input optical signals.
Journal ArticleDOI
Totally Destructive Many-Particle Interference.
Christoph Dittel,Christoph Dittel,Gabriel Dufour,Mattia Walschaers,Gregor Weihs,Andreas Buchleitner,Robert Keil +6 more
TL;DR: In a general, multimode scattering setup, it is shown how the permutation symmetry of a many-particle input state determines those scattering unitaries that exhibit strictly suppressed many- particle transition events.
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.
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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.