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
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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Proceedings ArticleDOI
Microring resonator based single qubit unitary for photonic quantum information processing
TL;DR: An architecture based on microring resonators that implement arbitrary single qubit unitary transforms useful in path encoded photonic quantum information processing and offers improved scalability when compared to the Mach-Zehnder Interferometer approach is proposed.
Posted Content
Single-photon detection and cryogenic reconfigurability in Lithium Niobate nanophotonic circuits
Emma Lomonte,Martin A. Wolff,Fabian Beutel,Simone Ferrari,Carsten Schuck,Wolfram H. P. Pernice,Francesco Lenzini +6 more
TL;DR: In this article, the authors demonstrate the combined operation of an electrically tunable Mach-Zehnder interferometer and two waveguide-integrated SNSPDs at its outputs.
Proceedings ArticleDOI
Arbitrary and self-configuring photonic circuits for sensing and processing
TL;DR: New architectures and simple configuration algorithms based on progressive single-parameter feedback loops allow complex photonic circuits to be set up and stabilized, and even to train themselves for complex tasks.
Patent
Interferometer and method of designing an interferometer
William R. Clements,Peter C. Humphreys,Benjamin J. Metcalf,Steven Kolthammer,Ian A. Walmsley +4 more
TL;DR: In this article, a universal interferometer for coupling modes of electromagnetic radiation according to a transformation has N inputs and N outputs for inputting and outputting N modes into and from the interferometers.
Journal ArticleDOI
Femtosecond laser micromachining for integrated quantum photonics
TL;DR: In this paper, a review article on the role of femtosecond laser micromachining (FLM) in the development of integrated quantum photonics is presented, which could further promote the field by convincing end-users of the great potentials of this technological platform and by stimulating more research groups to direct their efforts to the exciting field of quantum technologies.
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.