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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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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Integrated photonic tunable basic units using dual-drive directional couplers.
TL;DR: This work proposes and experimentally demonstrates a thermally actuated Dual-Drive Directional Coupler (DD-DC) design integrated on a silicon nitride platform and reports the experimental demonstration of the first integrated triangular waveguide mesh arrangement using DD-DC based TBUs.
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Visual assessment of multi-photon interference
TL;DR: It is found that nonlinear dimensionality reduction is capable to capture distinctive features in the spatial distribution of data related to multi-photon states with different evolutions, and will inspire further theoretical investigations, for instance for a reliable assessment of quantum computational advantage.
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Simulating Quantum Materials with Digital Quantum Computers
Lindsay Bassman,Miroslav Urbanek,Mekena Metcalf,Jonathan Carter,Alexander F. Kemper,Wibe A. de Jong +5 more
TL;DR: In this paper, the authors present a review of the available technology and algorithms to represent quantum materials on quantum computers and provide an organized overview of progress in the field for domain experts and an accessible introduction to scientists interested in beginning to perform their own simulations of quantum materials.
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Coherent and dynamic beam splitting based on light storage in cold atoms
TL;DR: In this article, a coherent and dynamic beam splitter based on light storage in cold atoms is demonstrated, where an input weak laser pulse is first stored in a cold atom ensemble via electromagnetically-induced transparency (EIT). A set of counter-propagating control fields, applied at a later time, retrieves the stored pulse into two output spatial modes.
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On unitary reconstruction of linear optical networks
TL;DR: In this article, a reconstruction approach based on a global optimization of element parameters is proposed to characterize the optical transformation of linear optical elements on chip, in particular passively stable interferometers.
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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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.