0000000000215215

AUTHOR

Niels Ubbelohde

showing 5 related works from this author

Partitioning of on-demand electron pairs

2014

The on-demand generation and separation of entangled photon pairs are key components of quantum information processing in quantum optics. In an electronic analogue, the decomposition of electron pairs represents an essential building block for using the quantum state of ballistic electrons in electron quantum optics. The scattering of electrons has been used to probe the particle statistics of stochastic sources in Hanbury Brown and Twiss experiments and the recent advent of on-demand sources further offers the possibility to achieve indistinguishability between multiple sources in Hong-Ou-Mandel experiments. Cooper pairs impinging stochastically at a mesoscopic beamsplitter have been succe…

PhysicsQuantum networkElectron pairCondensed Matter - Mesoscale and Nanoscale PhysicsBiomedical EngineeringFOS: Physical sciencesQuantum simulatorBioengineeringQuantum PhysicsElectronCondensed Matter PhysicsAtomic and Molecular Physics and OpticsOpen quantum systemQuantum dotQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)Computer Science::Programming LanguagesGeneral Materials ScienceQuantum algorithmElectrical and Electronic EngineeringQuantum informationComputer Science::DatabasesNature Nanotechnology
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A random-walk benchmark for single-electron circuits

2021

Mesoscopic integrated circuits aim for precise control over elementary quantum systems. However, as fidelities improve, the increasingly rare errors and component crosstalk pose a challenge for validating error models and quantifying accuracy of circuit performance. Here we propose and implement a circuit-level benchmark that models fidelity as a random walk of an error syndrome, detected by an accumulating probe. Additionally, contributions of correlated noise, induced environmentally or by memory, are revealed as limits of achievable fidelity by statistical consistency analysis of the full distribution of error counts. Applying this methodology to a high-fidelity implementation of on-dema…

Computer scienceScienceFOS: Physical sciencesGeneral Physics and AstronomyWord error rateQuantum metrology02 engineering and technologyIntegrated circuit01 natural sciencesNoise (electronics)ArticleGeneral Biochemistry Genetics and Molecular Biologylaw.inventionComputer Science::Hardware ArchitecturelawMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesElectronic devicesQuantum metrology010306 general physicsQuantumQuantum computerQuantum PhysicsMultidisciplinaryCondensed Matter - Mesoscale and Nanoscale PhysicsQuantum dotsQGeneral Chemistry021001 nanoscience & nanotechnologyRandom walkComputerSystemsOrganization_MISCELLANEOUSBenchmark (computing)Quantum Physics (quant-ph)0210 nano-technologyAlgorithmNature Communications
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Quantized current source with mesoscopic feedback

2011

We study a mesoscopic circuit of two quantized current sources, realized by nonadiabatic single-electron pumps connected in series with a small micron-sized island in between. We find that quantum transport through the second pump can be locked onto the quantized current of the first one by a feedback due to charging of the mesoscopic island. This is confirmed by a measurement of the charge variation on the island using a nearby charge detector. Finally, the charge feedback signal clearly evidences loading into excited states of the dynamic quantum dot during single-electron pump operation. © 2011 American Physical Society.

PhysicsMesoscopic physicsMesoscopic circuitCondensed Matter - Mesoscale and Nanoscale PhysicsDetectorFOS: Physical sciencesCharge (physics)02 engineering and technologyElectronCurrent source021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesSignalElectronic Optical and Magnetic MaterialsQuantum dotExcited stateMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesddc:530Dewey Decimal Classification::500 | Naturwissenschaften::530 | PhysikAtomic physics010306 general physics0210 nano-technologyPhysical Review B
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Roadmap on quantum nanotechnologies

2021

Quantum phenomena are typically observable at length and time scales smaller than those of our everyday experience, often involving individual particles or excitations. The past few decades have seen a revolution in the ability to structure matter at the nanoscale, and experiments at the single particle level have become commonplace. This has opened wide new avenues for exploring and harnessing quantum mechanical effects in condensed matter. These quantum phenomena, in turn, have the potential to revolutionize the way we communicate, compute and probe the nanoscale world. Here, we review developments in key areas of quantum research in light of the nanotechnologies that enable them, with a …

Materials scienceFOS: Physical sciencesBioengineeringnanotekniikka02 engineering and technology01 natural sciencesnanotieteet530quantum computingEveryday experience0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)Quantum metrologyquantum electrodynamicsGeneral Materials Scienceddc:530kvanttimekaniikkaElectrical and Electronic Engineering010306 general physicsQuantum information sciencekvanttifysiikkaQuantumQuantum tunnellingQuantum computerQuantum PhysicsnanotechnologyCondensed Matter - Mesoscale and Nanoscale PhysicsMechanical EngineeringMacroscopic quantum phenomenaObservableGeneral Chemistry021001 nanoscience & nanotechnology530 PhysikEngineering physicsquantum phenomena3. Good healthMechanics of Materials0210 nano-technologyQuantum Physics (quant-ph)Nanotechnology
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Dataset for Section 1.1 "Electrical quantum metrology with single electrons" of "Roadmap on quantum nanotechnologies" DOI:10.1088/1361-6528/abb333

2022

Dataset for Section 1.1 "Electrical quantum metrology with single electrons" in Arne Laucht et al Nanotechnology 32, 162003 (2021) "Roadmap on quantum nanotechnologies"

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