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
Hydrodynamical self-interference of a scattered polariton quanta.
TL;DR: Experimental observations of quantum hydrodynamics in the single polariton limit test the wave-particle duality and aid in the development of polariton-based photonic circuits in quantum information processing.
Proceedings ArticleDOI
Single-path Two-photon Interference Effects Between Spatial Modes
Markus Hiekkamäki,Robert Fickler +1 more
TL;DR: In this paper, two-photon interference between photon spatial modes is demonstrated and the effect up to 4 dimensions is scaled up to 2.5 dimensions, which is a crucial step towards implementing photonic quantum computing with spatial modes.
Journal ArticleDOI
Interference from Two-Photon Sources in Silica-on-Silicon Circuits at Telecom Wavelength
TL;DR: In this article, the authors demonstrate a two-photon interference in the standard telecommunication band on a silica-on-silicon integrated photonic chip, which has an insertion loss less than 1 dB, is a Mach-Zehnder interferometer with a thermo-optic phase shifter.
Journal ArticleDOI
General mapping of multi-qu$d$it entanglement conditions to non-separability indicators for quantum optical fields.
TL;DR: In this article, it was shown that any multi-qudit entanglement witness leads to a non-separability indicator for quantum optical fields, which involves intensity correlations, e.g., necessary and sufficient conditions for intensity or intensity-rate correlations to reveal polarization entropy.
Posted Content
Towards field-programmable photonic gate arrays
TL;DR: Some of the basic principles, fundamentals, technologies, architectures and recent advances leading to the implementation of Field Programmable Photonic Field Arrays (FPPGAs) are reviewed.
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.