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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Journal ArticleDOI
Relative multiplexing for minimising switching in linear-optical quantum computing
Mercedes Gimeno-Segovia,Hugo Cable,Gabriel J. Mendoza,Peter Shadbolt,Joshua W. Silverstone,Jacques Carolan,Jacques Carolan,Mark G. Thompson,Jeremy L. O'Brien,Terry Rudolph +9 more
TL;DR: In this paper, the authors introduce relative multiplexing (RMUX), a general-purpose optimization which can dramatically reduce the active switching requirements for MUX in LOQC, and thereby reduce hardware complexity and energy consumption.
Journal ArticleDOI
Superconducting nanowire single-photon detectors for quantum information
TL;DR: In this paper, the authors present the requirements of single-photon detectors from quantum information, as well as the principle, key metrics, latest performance issues and other issues associated with SNSPD.
Journal ArticleDOI
Silicon Photonics Rectangular Universal Interferometer
Daniel Pérez,Ivana Gasulla,Francisco Javier Fraile,Lee Crudgington,David J. Thomson,Ali Z. Khokhar,Ke Li,Wei Cao,Goran Z. Mashanovich,José Capmany +9 more
TL;DR: In this article, the implementation of a fixed rectangular universal interferometer using a reconfigurable hexagonal waveguide mesh circuit is described, and a suitable adaptation synthesis algorithm tailored to this mesh configuration is provided.
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Arbitrary d -dimensional Pauli X gates of a flying qudit
Xiaoqin Gao,Mario Krenn,Mario Krenn,Jaroslav Kysela,Jaroslav Kysela,Anton Zeilinger,Anton Zeilinger +6 more
TL;DR: In this paper, the authors proposed a method to perform deterministic arbitrary high-dimensional Pauli $X$ gates for single photons carrying orbital angular momentum. But the proposed experimental setups only use two basic optical elements such as mode sorters and mode shifters and thus could be implemented in any system where these experimental tools are available.
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Hardware error correction for programmable photonics
TL;DR: In this article, the authors present a deterministic approach to correcting circuit errors by locally correcting hardware errors within individual optical gates, and apply their approach to simulations of large scale optical neural networks and infinite impulse response filters implemented in programmable photonics, finding that they remain resilient to component error well beyond modern day process tolerances.
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
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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.
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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.