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
Citations
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Journal ArticleDOI
Hybrid integration methods for on-chip quantum photonics
TL;DR: In this article, the authors review recent advances in integrated quantum photonics based on such hybrid systems and discuss the remaining challenges and future prospects of on-chip quantum photonic with integrated quantum emitters.
Journal ArticleDOI
Quantum Walk Experiments Using a 32 × 32 Silicon Photonic Path-Independent Insertion Loss Switch as a Stable Multiport Interferometer
TL;DR: In this article , a 32 × 32 silicon photonic path-independent insertion loss switch was used as a programmable multiport interferometer, with a robustness to optical losses appropriate for many classical and quantum photonic applications.
Proceedings ArticleDOI
Space qualification of integrated photonic circuits fabricated by ultrafast laser writing
Simone Piacentini,Tobias Vogl,Tobias Vogl,Tobias Vogl,Giacomo Corrielli,Ping Koy Lam,Roberto Osellame +6 more
TL;DR: In this paper, the first time the space qualification of integrated photonic circuits fabricated by ultrafast laser writing was presented, and it was shown that their integrated devices are suited for performing quantum experiments in a low Earth orbit.
Posted Content
Fock Space Perspective on Optimal Heralding Schemes
TL;DR: In this paper, the design of optimal heralding schemes in linear optical quantum computing context is addressed, and the problem admits unit fidelity formulation in relevant Fock space, thanks to linear optic feasibility criteria of [Phys. Rev. A100, 022301; arXiv:1901.06178].
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
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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.