[PDF] Investigation Of Coherent Microscopic Defects Inside The Tunneling Barrier Of A Josephson Junction eBook

Author : Grabovskij, Grigorij Jurevic
Publisher : KIT Scientific Publishing
Page : 124 pages
File Size : 50,12 MB
Release : 2014-08-07
Category : Physics
ISBN : 3731502100

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In disordered solids, two-level atomic-tunneling systems are present in large quantity. Only recently, superconducting qubits opened a door for a detection and individual coherent manipulation of such microscopic quantum systems. We succeeded to tune the resonance frequencies of these systems by applying external strain on the qubit chip. Moreover, we observed and analyzed the interaction between two coupled tunneling systems.

Author : Grigorij Jur'evic Grabovskij
Publisher :
Page : 120 pages
File Size : 22,17 MB
Release : 2020-10-09
Category : Science
ISBN : 9781013280061

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In disordered solids, two-level atomic-tunneling systems are present in large quantity. Only recently, superconducting qubits opened a door for a detection and individual coherent manipulation of such microscopic quantum systems. We succeeded to tune the resonance frequencies of these systems by applying external strain on the qubit chip. Moreover, we observed and analyzed the interaction between two coupled tunneling systems. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Author : Wildermuth, Matthias Micha
Publisher : KIT Scientific Publishing
Page : 160 pages
File Size : 41,21 MB
Release : 2023-09-11
Category :
ISBN : 373151303X

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In the last decades, superconducting devices have emerged as a promising platform for quantum technologies, including quantum sensing and quantum computing. Their key elements are Josephson junctions, which allow for coherent supercurrent tunneling between two weakly linked superconductors. If such a junction is extended in one direction to a long junction, the superconducting phase difference can vary in space and time and may allow for quantized phase windings that drive supercurrent vortices.

Author : Maerkl, Junji Tobias
Publisher : KIT Scientific Publishing
Page : 114 pages
File Size : 26,20 MB
Release : 2016-01-20
Category : Physics
ISBN : 3731504359

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In this work, magnetic atoms on surfaces are studied with low-temperature scanning tunneling microscopy. Motivated by the idea to use single atoms as magnetic bits, the factors that allow or prevent long-term stability of their magnetic moments are investigated. Lifetimes of up to several minutes can be achieved for the magnetic moments of holmium atoms on a Pt(111) surface, resulting from the combined symmetries of the system. Corresponding theoretical calculations are presented and evaluated.

Author : Rai, Vibhuti Narayan
Publisher : KIT Scientific Publishing
Page : 150 pages
File Size : 10,45 MB
Release : 2022-10-04
Category : Science
ISBN : 3731512017

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In this work, a clear pathway is presented to achieve well-defined electronically decoupled chromophores from metallic leads without requiring additional insulating layers. To study such self-decoupled molecules, STM equipped with an efficient light detection setup has been used. Results show that the chromophores mounted on tripodal molecular platforms adsorbed on a gold surface present well-defined and efficient electroluminescence down to the single-molecule level.

Author : Schackert, Michael Peter
Publisher : KIT Scientific Publishing
Page : 148 pages
File Size : 35,89 MB
Release : 2015-03-23
Category : Physics
ISBN : 3731502380

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This work describes the experimental study of electron-boson interactions in superconductors by means of inelastic electron tunneling spectroscopy performed with a scanning tunneling microscope (STM) at temperatures below 1 K. This new approach allows the direct measurement of the Eliashberg function of conventional superconductors as demonstrated on lead (Pb) and niobium (Nb). Preparative experiments on unconventional iron-pnictides are presented in the end.

Author : Pfirrmann, Marco
Publisher : KIT Scientific Publishing
Page : 136 pages
File Size : 18,90 MB
Release : 2020-10-05
Category : Science
ISBN : 3731510030

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In this book, hybrid systems based on yttrium-iron-garnet (YIG), three dimensional microwave cavity resonators, and superconducting transmon qubits, are investigated by continuous wave and pulsed microwave spectroscopy. Limitations to the magnetic linewidth in the quantum regime are identified and coherent exchange between a magnon and a superconducting qubit are demonstrated. Finally, a first step towards a strongly coupled hybrid system containing all three components is demonstrated.