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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Quantifying entanglement in a 68-billion-dimensional quantum state space.
James Schneeloch,Christopher C. Tison,Christopher C. Tison,Michael L. Fanto,Michael L. Fanto,Paul M. Alsing,Gregory A. Howland,Gregory A. Howland +7 more
TL;DR: This work improves an entropic, quantitative entanglement witness to operate directly on compressed experimental data acquired via an adaptive, multilevel sampling procedure, and offers a universal method for quantifyingEntanglement in any large quantum system shared by two parties.
Journal ArticleDOI
On-chip transverse-mode entangled photon pair source
Lan-Tian Feng,Ming Zhang,Xiao Xiong,Yang Chen,Hao Wu,Ming Li,Guo-Ping Guo,Guang-Can Guo,Daoxin Dai,Xi-Feng Ren +9 more
TL;DR: Dai et al. as mentioned in this paper reported an on-chip transverse-mode entangled photon pair source via spontaneous four-wave mixing processes in a multimode silicon waveguide, achieving a maximally entangled Bell state with a net fidelity of 0.96'±'0.01'.
Journal ArticleDOI
High-extinction electro-optic modulation on lithium niobate thin film.
TL;DR: A cascaded Mach-Zehnder interferometry design is exploited to offset fabrication errors in integrated nanophotonics, demonstrating up to 53 dB modulation extinction for a wide range of wavelengths between 1500 nm and 1600 nm.
Journal ArticleDOI
High-Performance Computing with Quantum Processing Units
Keith A. Britt,Travis S. Humble +1 more
TL;DR: In this article, the authors examine how QPUs can be integrated into current and future HPC system architectures by accounting for functional and physical design requirements, and identify two integration pathways that are differentiated by infrastructure constraints on the QPU and the use cases expected for the HPC systems.
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.
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.