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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Experimental Realization of a Quantum Autoencoder: The Compression of Qutrits via Machine Learning
TL;DR: In this paper, a quantum autoencoder is proposed to compress quantum data using a classical optimization routine, which is able to perform with minimal prior information about the quantum data or physical system and is robust to perturbations during its optimization routine.
Journal ArticleDOI
Feedback control for microring weight banks
Alexander N. Tait,Hasitha Jayatilleka,Thomas Ferreira de Lima,Philip Y. Ma,Mitchell A. Nahmias,Bhavin J. Shastri,Sudip Shekhar,Lukas Chrostowski,Paul R. Prucnal +8 more
TL;DR: Continuous, multi-channel control of a microring weight bank with an effective 5.1 bits of accuracy on 2Gbps signals is demonstrated and feedback weight control renders tractable the weight control problem in reconfigurable analog photonic networks.
Journal ArticleDOI
Orbital angular momentum of photons and the entanglement of Laguerre-Gaussian modes
TL;DR: In this article, the first quantum experiment with orbital angular momentum (OAM) was described and the first steps into applying these properties in novel quantum protocols were discussed. And several interesting open questions that could form the subject of future investigations with OAM.
Journal ArticleDOI
Accelerating recurrent Ising machines in photonic integrated circuits
Mihika Prabhu,Charles Roques-Carmes,Yichen Shen,Nicholas C. Harris,Li Jing,Jacques Carolan,Ryan Hamerly,T. Baehr-Jones,Michael Hochberg,Vladimir Ceperic,John D. Joannopoulos,Dirk Englund,Marin Soljacic +12 more
TL;DR: A proof-of-principle integrated nanophotonic recurrent Ising sampler (INPRIS) is experimentally demonstrated, using a hybrid scheme combining electronics and silicon-on-insulator photonics, that is capable of converging to the ground state of various four-spin graphs with high probability.
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Experimental multiphase estimation on a chip
Emanuele Polino,Martina Riva,Mauro Valeri,Raffaele Silvestri,Giacomo Corrielli,Andrea Crespi,Nicolò Spagnolo,Roberto Osellame,Fabio Sciarrino +8 more
TL;DR: This work reports the experimental implementation of a reconfigurable integrated multimode interferometer designed for the simultaneous estimation of two optical phases and demonstrates quantum-enhanced performances in two-phase estimation with respect to the best classical case, post-selected to the number of detected coincidences.
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.