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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Journal ArticleDOI
Integrated-optics heralded controlled-NOT gate for polarization-encoded qubits
Jonas Zeuner,Aditya N. Sharma,Max Tillmann,René Heilmann,René Heilmann,Markus Gräfe,Markus Gräfe,Amir Moqanaki,Alexander Szameit,Philip Walther +9 more
TL;DR: In this article, the authors present an implementation of a heralded controlled-not gate on chip for all-optical quantum networks and quantum repeaters using femtosecond-laser-written waveguides.
Journal ArticleDOI
Multi-core fiber integrated multi-port beam splitters for quantum information processing
Jaime Cariñe,Gustavo Cañas,Paul Skrzypczyk,Ivan Šupić,Nayda Guerrero,Tania García,L. Pereira,M. A. S. Prosser,Guilherme B. Xavier,Aldo Delgado,Stephen P. Walborn,Daniel Cavalcanti,Gustavo Lima +12 more
TL;DR: This work reports on the production of high-quality N×N (with N=4,7) multi-port beam splitters based on a new scheme for manipulating multi-core optical fibers and demonstrates that fast switching, low loss, and high optical quality for high-dimensional quantum information can be simultaneously achieved with multi- core fiber technology.
Journal ArticleDOI
Symmetric polarization insensitive directional couplers fabricated by femtosecond laser waveguide writing
Giacomo Corrielli,Simone Atzeni,Simone Piacentini,Ioannis Pitsios,Andrea Crespi,Roberto Osellame +5 more
TL;DR: This study proposes and demonstrates experimentally directional couplers that yield a polarization-independent power splitting and, at the same time, preserve the polarization state of the propagating light.
Posted Content
High-Performance Computing with Quantum Processing Units
Keith A. Britt,Travis S. Humble +1 more
TL;DR: This work identifies two integration pathways that are differentiated by infrastructure constraints on the QPU and the use cases expected for the HPC system, and finds that the performance of both approaches is likely to depend on the quantum interconnect that serves to entangle multiple QPUs.
Journal ArticleDOI
Nonlinear integrated quantum electro-optic circuits
Kai-Hong Luo,Sebastian Brauner,Christof Eigner,Polina R. Sharapova,Raimund Ricken,Torsten Meier,Harald Herrmann,Christine Silberhorn +7 more
TL;DR: In this article, an electro-optic device, including photon pair generation, propagation, and path routing, was demonstrated on a single Ti:LiNbO 3 waveguide chip.
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.