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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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
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BosonSampling with lost photons
Scott Aaronson,Daniel J. Brod +1 more
TL;DR: In this paper, the authors investigated the complexity of BosonSampling under photon losses, more specifically, the case where an unknown subset of the photons is randomly lost at the sources, and they showed that if $k$ out of $n$ photons are lost, then we cannot sample classically from a distribution that is $1/{n}^{\mathrm{\ensuremath{\Theta))(k)}$ close (in total variation distance) to the ideal distribution, unless a BPP+NP machine can estimate the permanents of Gaussian matrices in
Journal ArticleDOI
Integration of Quantum Emitters with Lithium Niobate Photonics
Shahriar Aghaeimeibodi,Boris Desiatov,Je-Hyung Kim,Chang-Min Lee,Mustafa Atabey Buyukkaya,Aziz Karasahin,Christopher J. K. Richardson,Richard P. Leavitt,Marko Loncar,Edo Waks +9 more
TL;DR: In this article, the authors demonstrate deterministic coupling of single-photon emitters with a lithium niobate photonic chip, which is an ideal material substrate for quantum photonics because it can tightly confine light in small waveguides and has strong electro-optic effect that can switch and modulate single photons at low power and high speed.
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Parallel Programming of an Arbitrary Feedforward Photonic Network
Sunil Pai,Ian A. D. Williamson,Tyler W. Hughes,Momchil Minkov,Olav Solgaard,Shanhui Fan,David A. B. Miller +6 more
TL;DR: A graph-topological approach is introduced that defines the general class of feedforward networks and identifies columns of non-interacting nodes that can be adjusted simultaneously by simultaneously nullifying the power in one output of each node via optoelectronic feedback onto adjustable phase shifters or couplers.
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Optical complex media as universal reconfigurable linear operators
TL;DR: This work proposes a way to perform linear operations using complex optical media such as multimode fibers or scattering media as a computational platform driven by wavefront shaping to offer the prospect of reconfigurable, robust, and easy-to-fabricate linear optical analog computation units.
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.
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.