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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Journal ArticleDOI
The time is right for multiphoton entangled states
Anna C. Peacock,Michael J. Steel +1 more
TL;DR: It is shown how a highly nonlinear optical glass can enable the on-chip generation of biphoton as well as multiphoton entangled qubits.
Journal ArticleDOI
Symmetry Allows for Distinguishability in Totally Destructive Many-Particle Interference
Julian Münzberg,Christoph Dittel,Maxime Lebugle,Andreas Buchleitner,Alexander Szameit,Gregor Weihs,Robert Keil +6 more
TL;DR: In this paper, the intricacies of Hong-Ou-Mandel interference with many photons in multiple modes are experimentally explored, having implications for the validation of boson sampling.
Journal ArticleDOI
Quantum Advantage with Membosonsampling
Jun Gao,Xiao-wei Wang,Wen-Hao Zhou,Zhiqiang Jiao,Ruo-Jing Ren,Yu-Xuan Fu,Lu-Feng Qiao,Xiaoying Xu,Chao Ni Zhang,Xiao-Ling Pang,Hang Li,Yao Wang,Xian-Min Jin +12 more
TL;DR: In this paper , a new variant of the problem, membosons sampling, exploiting the scaling of the Boson sampling problem can be in principle extended to a large scale, and the results exhibit an integrated and cost-efficient shortcut stepping into the quantum advantage regime in a photonic system far beyond previous scenarios, and provide a scalable and controllable platform for quantum information processing.
Posted Content
Experimental Quantum Homomorphic Encryption
Jonas Zeuner,Ioannis Pitsios,Si-Hui Tan,Si-Hui Tan,Aditya N. Sharma,Aditya N. Sharma,Joseph F. Fitzsimons,Joseph F. Fitzsimons,Joseph F. Fitzsimons,Roberto Osellame,Philip Walther +10 more
TL;DR: This work demonstrates homomorphic-encrypted quantum computing with unitary transformations of individual qubits, as well as multi-qubit quantum walk computations using single-photon states and non-birefringent integrated optics, and shows the potential for delegated quantum computing using photons.
DissertationDOI
Multidimensional photonics in synthetic lattices
TL;DR: In this article, a controllable all-optical approach to synthetic frequency lattices in a nonlinear waveguide is presented, which is suitable to implement long-range interactions and artificial gauge fields.
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.