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
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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Dissertation
Electrical tuning of integrated III-V quantum dots in quantum nano-photonic circuits
TL;DR: In this article, a waveguide-coupled electrically-driven single-photon source is demonstrated, which can be controlled by applying electric fields to the devices, enabling fast switching and tuning of device behaviour.
Posted Content
Reconfigurable quantum phononic circuits via piezo-acoustomechanical interactions
TL;DR: In this paper, a phase shifter waveguide is used to produce ± pi phase shifts for GHz frequency phonons in 10s of microns with 10s volts applied to an aluminum nitride on suspended silicon.
Posted Content
Coherent quantum dynamics of systems with coupling-induced creation pathways
TL;DR: In this paper, the modal coupling introduces new creation pathways to a nonlinear optical process within the device, which quantum mechanically interfere to drive the system between states in the time domain, leading to cyclically evolving path-entanglement and the manifestation of coherent oscillations in second-order temporal correlations.
Posted Content
Quantum Experiments and Graphs II: Computation and State Generation with Probabilistic Sources and Linear Optics
TL;DR: It is shown how general linear optical quantum entanglement experiments with probabilistic sources can be described using graph theory using complex weights in undirected graphs, and how to easily understand in a graphical way quantum experiments such asEntanglement swapping.
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.