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Experiments on flux qubits with pi-shifters

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783866446441 Year: Volume: 1 Pages: XI, 110 p. DOI: 10.5445/KSP/1000022237 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:02:02
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The results of the research re-ported in this work show that tunable gap flux qubits have a potential for building quantum registers. Cavities coupled to flux qubits can be used for in-formation storage and transfer between qubits. SFS π-shifters provide a simple approach to bias multi-qubit circuits. A possibility to change the qubit resonance frequency while preserving qubit coherence enables implementation of switchable coupling between qubits and cavities.

Superconducting Multilayer Technology for Josephson Devices : Technology, Engineering, Physics, Applications

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Book Series: Karlsruher Schriftenreihe zur Supraleitung / Hrsg. Prof. Dr.-Ing. M. Noe, Prof. Dr. rer. nat. M. Siegel ISSN: 18691765 ISBN: 9783731501220 Year: Volume: 13 Pages: XIII, 175 p. DOI: 10.5445/KSP/1000036875 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:57
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Within this book fabrication processes for high-quality Josephson junctions based on niobium and aluminum oxide as well as niobium nitride and aluminum nitride on various substrates are discussed. Techniques for achieving a planar chip topography and sub-µm lateral dimensions, aiding the realization of sophisticated Josephson devices such as SQUIDs, flux-flow oscillators and long Josephson junctions with artificial phase discontinuities, are presented in detail.

Quantum simulation experiments with superconducting circuits

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731507802 Year: Volume: 20 Pages: III, 149 p. DOI: 10.5445/KSP/1000081315 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-28 18:37:01
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While the universal quantum computer seems not in reach for the near future, this work focusses on analog quantum simulation of intriguing quantum models of light-matter interactions, with the goal of achieving a computational speed-up as compared to classical hardware. Existing building blocks of quantum hardware are used from superconducting circuits, that have proven to be a very suitable experimental platform for the implementation of model Hamiltonians at a high degree of controllability.

Ultrafast nonlinear silicon waveguides and quantum dot semiconductor optical amplifiers

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Book Series: Karlsruhe Series in Photonics & Communications / Karlsruhe Institute of Technology, Institute of Photonics and Quantum Electronics (IPQ) ISSN: 18651100 ISBN: 9783866447486 Year: Volume: 7 Pages: VII, 260 p. DOI: 10.5445/KSP/1000024381 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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In this book, nonlinear silicon-organic hybrid waveguides and quantum dot semiconductor optical amplifiers are investigated. Advantageous applications are identified, and corresponding proof-of-principle experiments are performed. Highly nonlinear silicon-organic hybrid waveguides show potential for all-optical signal processing based on fourwave mixing and cross-phase modulation. Quantum dot semiconductor optical amplifiers operate as linear amplifiers with a very large dynamic range.

Charge Transport in DNA - Insights from Simulations

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ISBN: 9783731500827 Year: Pages: VI, 139 p. DOI: 10.5445/KSP/1000036065 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Chemistry (General)
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Charge transport and charge transfer (CT) capabilities of deoxyribonucleic acid (DNA) are investigated. A QM/MM multi-scale framework is applied to calculate the CT capabilities of DNA under conditions resembling the experimental setup. The simulations are able to explain and predict the outcome of experiments and therefore make suggestions in advance. Based on the findings, suitable DNA sequences can be opted for the design of DNA-based devices as nano-scale electronic elements.

High quality Nb/Al-AlOx/Nb Josephson junctions : technological development and macroscopic quantum experiments

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Book Series: Karlsruher Schriftenreihe zur Supraleitung / Hrsg. Prof. Dr.-Ing. M. Noe, Prof. Dr. rer. nat. M. Siegel ISSN: 18691765 ISBN: 9783866446519 Year: Volume: 004 Pages: XIX, 169 p. DOI: 10.5445/KSP/1000022422 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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Diese Arbeit beschreibt die Entwicklung einer Technologie für die Herstellung hochqualitativer sub-µm Nb/Al-AlOx/Nb-Josephson-Kontakte. Mit den dadurch entstandenen Bauteilen wurden verschiedene experimentell zuvor noch nicht beobachtete makroskopische Quanteneffekte nachgewiesen. Weiterhin wurden Nb-basierte Phasen-Qubits entworfen, hergestellt und gemessen, die längere Kohärenzzeiten als vergleichbare Bauelemente aus der Literatur aufweisen.

Linear and Nonlinear Semiconductor Optical Amplifiers for Next-Generation Optical Networks

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Book Series: Karlsruhe Series in Photonics and Communications / Karlsruhe Institute of Technology, Institute of Photonics and Quantum Electronics (IPQ) ISSN: 18651100 ISBN: 9783866449565 Year: Volume: 8 Pages: VIII, 246 p. DOI: 10.5445/KSP/1000031464 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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In this book, semiconductor optical amplifiers (SOAs) are studied with a view to linear and nonlinear applications in next-generation optical networks. Quantum-dot SOAs can be optimized for linear amplification of signals with different modulation formats and multiplexing techniques. Conversely, bulk SOAs can be easily optimized for operation in the nonlinear regime. However, due to the fast carrier recovery times in QD SOAs we also look into nonlinear applications with these devices.

Spectral Enhancement of Organic Photodetectors

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ISBN: 9783731501541 Year: Pages: VIII, 224 p. DOI: 10.5445/KSP/1000037753 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Solution-processed photodiodes with infrared sensitivities at wavelengths beyond the bandgap of silicon would be a significant advance towards cost-effective imaging. Colloidal quantum dots are highly suitable as infrared absorbers for photodetection. The concept of organic bulk heterojunctions sensitized with PbS nanocrystalline was proved with efficient near-infrared detection up to 1.8 mm for NIR imaging on active matrix TFT backplanes and demonstrated x-ray sensitivity.

Hybrid quantum system based on rare earth doped crystals

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Book Series: Experimental Condensed Matter Physics / Karlsruher Institut für Technologie, Physikalisches Institut ISSN: 21919925 ISBN: 9783731503453 Year: Volume: 16 Pages: II, 140 S DOI: 10.5445/KSP/1000045903 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Physics (General)
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Hybrid quantum circuits interfacing rare earth spin ensembles with microwave resonators are a promising approach for application as coherent quantum memory and frequency converter. In this thesis, hybrid circuits based on Er and Nd ions doped into Y?SiO? and YAlO? crystals are investigated by optical and on-chip microwave spectroscopy. Coherent strong coupling between the microwave resonator and spin ensemble as well as a multimode memory for weak coherent microwave pulses are demonstrated.

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