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
Citations
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Towards Quantum Supremacy with Lossy Scattershot Boson Sampling
TL;DR: The classical hardness of Boson sampling has been related to the Permanent-of-Gaussians Conjecture and has been extended to some generalizations such as Scattershot Boson Sampling, approximate and lossy sampling under some reasonable constraints as discussed by the authors.
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Quantum optics of lossy asymmetric beam splitters
TL;DR: This work theoretically investigates quantum interference of two single photons at a lossy asymmetric beam splitter, the most general passive 2×2 optical circuit and shows that the loss allows tunability of quantum interference to an extent not possible with a losslessbeam splitter.
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Resource-efficient high-dimensional subspace teleportation with a quantum autoencoder
Hui Zhang,Ling-ling Wan,Tobias Haug,Wai-Keong Mok,Stefano Paesani,Yuzhi Shi,Hong Cai,Lip Ket Chin,Muhammad Faeyz Karim,Limin Xiao,Xianshu Luo,Feng Gao,Bin Dong,Syed M. Assad,M. S. Kim,A. Laing,Leong Chuan Kwek,Ai Qun Liu +17 more
TL;DR: This work uses a quantum autoencoder to reduce resource costs for quantum teleportation of subspaces in high-dimensional systems in a compress-teleport-decompress manner and reports the first demonstration with qutrits using an integrated photonic platform for future scalability.
Integrated Quantum Photonics: from modular to monolithic integration
TL;DR: In this article, the authors present two new platforms for scalable implementation of quantum optical circuits, namely, modular approach and monolithic integration, which can integrate sources and detectors by first fabricating the devices on their own platform and then transferring and combining them together.
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On-Chip Integrated Single Photon Source-Optically Resonant Metastructure Based Scalable Quantum Optical Circuits
TL;DR: In this article, a new class of ordered single quantum dots of controlled size and shape named Mesa-top Single Quantum Dots (MTSQDs) are introduced to realize on-chip optical quantum information processing (QIP) systems comprising (1) single photon source (SPS) arrays, here based on a new set of ordered Mie-like optical resonances provided, simultaneously, all the needed light manipulating functions.
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.
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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.