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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A photonic frequency octo-tupler with reduced RF drive power and extended spurious sideband suppression
Mehedi Hasan,Trevor J. Hall +1 more
TL;DR: In this paper, a Mach-Zehnder interferometer with each arm containing a pair of MZM modulators in series is proposed as a means of optoelectronic frequency multiplication.
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Fundamental building block for all-optical scalable quantum networks
TL;DR: In this paper, the authors derived the fundamental limits of the efficiency and loss tolerance of the Bell measurement with multiple photons, restricted not by protocols but by the laws of physics, i.e., linear optics and no-cloning theorem.
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Low power reconfigurability and reduced crosstalk in integrated photonic circuits fabricated by femtosecond laser micromachining
Francesco Ceccarelli,Simone Atzeni,Ciro Pentangelo,Francesco Pellegatta,Andrea Crespi,Roberto Osellame +5 more
TL;DR: In this article, thermally-insulating three-dimensional microstructures are exploited to decrease the power needed to induce a 2-pi phase shift down to 37 mW and to reduce the thermal crosstalk to a few percent.
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Programmable linear quantum networks with a multimode fibre
Saroch Leedumrongwatthanakun,Luca Innocenti,Hugo Defienne,Hugo Defienne,Thomas Juffmann,Thomas Juffmann,Thomas Juffmann,Alessandro Ferraro,Mauro Paternostro,Sylvain Gigan +9 more
TL;DR: In this article, the authors demonstrate a potentially scalable route towards reconfigurable optical networks based on the use of a multimode fiber and advanced wavefront-shaping techniques, and experimentally validate the accuracy and robustness of their approach using two-photon quantum states.
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Programmable Integrated Silicon Photonics Waveguide Meshes: Optimized Designs and Control Algorithms
TL;DR: This paper reviews the state of the art of general-purpose waveguide mesh arrangements with a special focus on those that allow the synthesis of optical feedback loops and proposes for the first time, a new design approach to generate wave guide mesh patterns with equally-oriented components.
References
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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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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.