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
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Photonic Quantum Metrology
TL;DR: In this paper, the authors present the current state of the art in the field in terms of platforms and quantum resources, and discuss the current experimental and theoretical challenges, and the open questions towards implementation of photonic quantum sensors with quantumenhanced performances in the presence of noise.
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Large-scale quantum photonic circuits in silicon
Nicholas C. Harris,Darius Bunandar,Mihir Pant,Greg Steinbrecher,Jacob Mower,Mihika Prabhu,Tom Baehr-Jones,Michael Hochberg,Dirk Englund +8 more
TL;DR: The silicon-on-insulator (SOI) nanophotonics platform as mentioned in this paper offers new possibilities for quantum optics, including the integration of bright, nonclassical light sources, based on the large third-order nonlinearity of silicon, alongside quantum state manipulation circuits with thousands of optical elements, all on a single phase-stable chip.
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Suppression law of quantum states in a 3D photonic fast Fourier transform chip.
Andrea Crespi,Roberto Osellame,Roberto Osellame,Roberta Ramponi,Roberta Ramponi,Marco Bentivegna,Fulvio Flamini,Nicolò Spagnolo,Niko Viggianiello,Luca Innocenti,Paolo Mataloni,Fabio Sciarrino +11 more
TL;DR: A scalable approach for the implementation of the fast Fourier transform algorithm using three-dimensional photonic integrated interferometers, fabricated via femtosecond laser writing technique, and results demonstrate genuine quantum interference between the injected photons, thus offering a powerful tool for diagnostic of photonic platforms.
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Quantum Optical Neural Networks
TL;DR: Through numerical simulation and analysis, the QONN is trained to perform a range of quantum information processing tasks, including newly developed protocols for quantum optical state compression, reinforcement learning, black-box quantum simulation, and one-way quantum repeaters.
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Demonstration of a 4 × 4-port universal linear circuit
TL;DR: In this paper, the authors demonstrate a simple generic silicon photonic circuit, combined with electronic control and software feedback, that can perform any linear operation between its four input ports and output ports.
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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.
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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.