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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Accurate and precise characterization of linear optical interferometers
TL;DR: In this article, single and two-photon interference procedures are combined for characterizing any multi-port linear optical interferometer accurately and precisely, and a scattershot approach is devised to effect a reduction in the experimental time required to characterize the interferometers.
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Certification of Gaussian Boson Sampling via graphs feature vectors and kernels
Taira Giordani,Valerio Mannucci,Nicolò Spagnolo,Marco Fumero,Arianna Rampini,Emanuele Rodolà,Fabio Sciarrino +6 more
TL;DR: This work interprets the properties of the feature vectors of the graph encoded in the device as a signature of correct sampling from the true input state and proposes a novel approach to the actual need for tailored algorithms to benchmark large-scale Gaussian Boson Samplers.
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Polarization-controlled amplified spontaneous emission in 2D semiconductors with birefringent microcavity
Jin-Woo Jung,Hyeon-Seo Choi,Tae-Jin Lee,Young-Jun Lee,Sang-Hyun Hong,Jang-Won Kang,Chang-Hee Cho +6 more
TL;DR: In this article, the authors report on the polarization-controlled amplification of excitonic emission in the monolayer WS2 coupled with ZnO microcavity, which can be tailored by the whispering gallery modes of the birefringent ZnNO micro cavity and the light input-light output curves exhibit the clear threshold kink and the superlinear increase in the output intensity for both the TM and TE polarization modes.
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Stability of quantum linear logic circuits against perturbations
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Photon-pair and heralded single photon generation initiated by a fraction of a 10 Gbps data stream
TL;DR: There may be no need for a separate laser to generate high-quality photon pairs for quantum applications in a typical optical communications network, according to results from a fraction of a classical 10 Gigabits-per-second, non-return-to-zero data stream.
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.