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
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Posted Content
Towards integrated superconducting detectors on lithium niobate waveguides
Jan Philipp Höpker,Moritz Bartnick,Evan Meyer-Scott,Frederik Thiele,Stephan Krapick,Nicola Montaut,Matteo Santandrea,Harald Herrmann,Sebastian Lengeling,Raimund Ricken,Viktor Quiring,Torsten Meier,Adriana E. Lita,Varun B. Verma,Thomas Gerrits,Sae Woo Nam,Christine Silberhorn,Tim J. Bartley +17 more
TL;DR: In this paper, the authors report on progress integrating tungsten transition-edge sensors (TESs) and amorphous Tungsten silicide superconducting nanowire single-photon detectors (SNSPDs) on titanium in-diffused lithium niobate waveguides.
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Criteria for single photon sources with variable nonclassicality threshold
Lukáš Lachman,Radim Filip +1 more
TL;DR: In this paper, variable experimental tests, based on adjustable linear optical networks and single photon detectors, giving a hierarchy of such nonclassicality criteria are proposed, which goes beyond the Hanbury - Brown - Twiss test of photon antibunching and allows us to compare faithfully quality and performance of single-photon sources via their non-classical properties.
Phase Estimation in Linear and Nonlinear Interferometers
TL;DR: A chronology of key events and quotes from the 12-month investigation into the deaths of six British men and women at the 2012 London bombings is published.
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Unidirectional scattering with spatial homogeneity using correlated photonic time disorder
TL;DR: In this article , an engineered time scatterer was proposed to provide unidirectional scattering with controlled scattering amplitudes, and the order-to-disorder transition in the time domain allowed the manipulation of scattering bandwidths, which makes resonance-free temporal colour filtering possible.
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Permanents, Bosons and Linear Optics
TL;DR: The comparison of the bosonic and fermionic case clarifies the controversy, and the more elaborate oscillator model provides a deeper analogy.
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.