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
Pattern Recognition Techniques for Boson Sampling Validation
Iris Agresti,Niko Viggianiello,Fulvio Flamini,Nicolò Spagnolo,Andrea Crespi,Andrea Crespi,Roberto Osellame,Roberto Osellame,Nathan Wiebe,Fabio Sciarrino +9 more
TL;DR: In this paper, machine learning techniques are used to identify malfunctions in hardware used to demonstrate quantum supremacy, which is itself a critical milestone on the road to a scalable universal quantum computer.
Journal ArticleDOI
Classical simulation of photonic linear optics with lost particles
Michał Oszmaniec,Daniel J. Brod +1 more
TL;DR: In this paper, the authors explore the possibility of efficient classical simulation of linear optics experiments under the effect of particle losses and show that it is possible to approximate the output statistics already if the number of photons that are left grows logarithmically with ε, regardless of the geometry of the network.
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Leveraging Chaos for Wave-Based Analog Computation: Demonstration with Indoor Wireless Communication Signals
TL;DR: It is shown that off-the-shelf wireless communication infrastructure in combination with a simple reflect-array suffices to perform analog computation with Wi-Fi waves reverberating in a room.
Journal ArticleDOI
Quantum-dot-based deterministic photon-emitter interfaces for scalable photonic quantum technology.
TL;DR: In this article, the authors present the physics of deterministic photon-emitter interfaces, including the main photonic building blocks required to scale up, and discuss quantitative performance benchmarks.
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Silicon Photonics Codesign for Deep Learning
TL;DR: The detailed analysis of a silicon photonic integrated circuit shows that a codesigned implementation based on the decomposition of large matrix-vector multiplication into smaller instances and the use of nonnegative weights could significantly simplify the photonic implementation of the matrix multiplier and allow increased scalability.
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.