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
Hardware Error Correction for MZI-Based Matrix Computation
Pengfei Xu,Hui Su +1 more
TL;DR: In this paper , the authors identify the main hardware error sources of MZI-based matrix computation, summarize the available hardware error correction methods from the perspective of the entire MZI meshes and a single MZI device, and propose a new architecture that will largely improve the precision of matrix computation without increasing the size of the MZI's mesh.
Journal ArticleDOI
Bidirectional Deep Learning of Polarization Transfer in Liquid Crystals with Application to Quantum State Preparation
TL;DR: In this paper , both the direct and inverse models based on deep neural networks, radial basis functions, and linear interpolation were proposed to predict control voltages required to prepare a target polarization.
Journal ArticleDOI
Improving SPDC single-photon sources via extended heralding and feed-forward control
TL;DR: In this article, the authors proposed an extended heralding scheme to mitigate the reduction of single-photon generation rate under spectral filtering by removing cases where we detect light in the rejection band of the heralding photon's filter.
Proceedings ArticleDOI
Femtosecond-laser written universal quantum photonic processors
Ciro Pentangelo,Francesco Ceccarelli,N. Di Giano,Rolf Arpe,Simone Piacentini,Andrea Crespi,Roberto Osellame +6 more
TL;DR: In this article , a femtosecond laser writing (FLW) based universal quantum photonic processors (UQPPs) are implemented on programmable photonic integrated circuits on which any arbitrary unitary transformation can be implemented on a given input quantum state.
Proceedings ArticleDOI
Variational Quantum Unsampling on a Programmable Nanophotonic Processor
Jacques Carolan,Masoud Mosheni,Jonathan P. Olson,Mihika Prabhu,Changchen Chen,Darius Bunandar,Nicholas C. Harris,Franco N. C. Wong,Michael Hochberg,Seth Lloyd,Dirk Englund +10 more
TL;DR: The Variational Quantum Unsampling (VQU) protocol as mentioned in this paper is a nonlinear quantum neural network approach for verification and inference of near-term quantum circuits outputs, which can be applied to a quantum photonic processor.
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.
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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.