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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Proceedings ArticleDOI
Silicon photonics packaging using engineered scattering elements
Tyler V. Howard,Thomas G. Brown +1 more
TL;DR: In this paper , a short-wave infrared microscope was used to measure the polarization of SiN and Si waveguides fabricated in the AIM Photonics foundry, showing extinction values up to 30x between orthogonal polarizations for the engineered scattering elements.
Proceedings ArticleDOI
Broadband Tunable Electro-Optic Switch in Integrated Lithium Niobate Waveguide Circuits
TL;DR: In this article , a fast optical switch in LiNbO3 photonic-circuit chip integrating an electro-optic (EO) polarization-mode converter and a broadband adiabatic polarizing-beam splitter was reported.
Posted Content
Multiscale Phase Retrieval
TL;DR: This work shows that both holography and phase retrieval are capable of quantum-limited coherent signal estimation and it describes phase retrieval strategies that approach the quantum limit for >1 megapixel fields.
Proceedings ArticleDOI
Processing high-dimensional entanglement with a programmable light converter
TL;DR: This work demonstrates a reconfigurable and scalable processor of entangled photons based on multi-plane light conversion that can perform key tasks of quantum information processing including high-dimensional entanglement certification and random unitary transformations.
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.