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
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Journal ArticleDOI
Reconfigurable multiport switch in coupled mode devices.
TL;DR: In this paper, the authors consider a coupled mode system where the effective propagation constants of localized modes are amenable to modulation and demonstrate that small, periodic modulation of the propagation constants enhance power transfer using a slowly varying envelope approximation for the field mode amplitudes.
Proceedings ArticleDOI
Quantum tomography based on principles of completeness, adequacy and fidelity
TL;DR: A general approach for estimating quantum circuits by means of measurements is presented, using the methods of quantum states and processes tomography developed in previous works to define the adequate models of theStates and processes under consideration.
Journal ArticleDOI
Low-depth optical neural networks
TL;DR: In this article , a low-depth optical neural network (LD-ONN) based on OCTOPUS architecture is proposed, which can also be applied individually as a linear perceptron for solving classification problems.
Proceedings ArticleDOI
Simulating Universal Gaussian Circuits with Linear Optics
TL;DR: In this paper, a universal procedure for simulating sampling from arbitrary non-linear photonic Gaussian circuits with passive linear optics was developed, provided two-mode squeezed vacuum states are available as a prior resource.
Journal ArticleDOI
Experimental Progress on Quantum Coherence: Detection, Quantification, and Manipulation
TL;DR: There has been significant interest in the characterization of quantum coherence as a resource, investigating how coherence can be extracted and used for quantum technological applications as mentioned in this paper, focusing in particular on recent experimental efforts.
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.