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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Single-photon three-qubit quantum logic using spatial light modulators
Kumel H. Kagalwala,Giovanni Di Giuseppe,Giovanni Di Giuseppe,Ayman F. Abouraddy,Bahaa E. A. Saleh +4 more
TL;DR: An experimental demonstration of three-qubit single-photon, linear, deterministic quantum gates that exploit photon polarization and the two-dimensional spatial-parity-symmetry of the transverse single-Photon field are demonstrated.
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Self-Configuring and Reconfigurable Silicon Photonic Signal Processor
TL;DR: This research presents a new generation of photonic signal processors that combine laser-spot assisted, 3D image recognition, and 3D signal recognition technologies that were first proposed in the 1990s and 2002 respectively.
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Programmable multifunctional integrated nanophotonics
TL;DR: In this paper, a review of the recent advances reported in the field of PMIN and, especially, in those based on integrated photonic waveguide meshes, both from the theoretical as well as from the experimental point of view is presented.
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Boson sampling with Gaussian measurements
TL;DR: In this article, an alternative boson sampling model operating on single-photon states followed by linear interferometry and Gaussian measurements is developed, making use of the symmetry of quantum evolution under time reversal.
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Experimental time-reversed adaptive Bell measurement towards all-photonic quantum repeaters.
Yasushi Hasegawa,Rikizo Ikuta,Nobuyuki Matsuda,Kiyoshi Tamaki,Hoi-Kwong Lo,Takashi Yamamoto,Koji Azuma,Nobuyuki Imoto +7 more
TL;DR: A modified scheme for Bell state measurements which reduces the necessary resources for realising such an all-photonic repeater, and a proof-of-principle implementation of the implementation are shown.
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.
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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.