Author : Alexey Feofanov
Publisher : KIT Scientific Publishing
Page : 126 pages
File Size : 34,46 MB
Release : 2014-08-20
Category : Science
ISBN : 3866446446
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.
Author : Schneider, Andre
Publisher : KIT Scientific Publishing
Page : 170 pages
File Size : 16,69 MB
Release : 2021-06-04
Category : Science
ISBN : 3731510324
Quantum sensing is a vast and emerging field enabling in-situ studies of quantum systems and hence the development of quantum hybrid systems. This work creates the fundament of direct superconducting-magnetic hybrid systems by developing a local microwave sensing scheme and studying the influence of a static magnetic field on a superconducting qubit. Finally, a proof-of-principle hybrid system is demonstrated, which opens the path towards superconducting-magnetic quantum circuits.
Author : Bilmes, Alexander
Publisher : KIT Scientific Publishing
Page : 128 pages
File Size : 13,6 MB
Release : 2019-12-09
Category : Science
ISBN : 3731509679
Author : Chen, Jinjie
Publisher : KIT Scientific Publishing
Page : 146 pages
File Size : 13,2 MB
Release : 2019-01-18
Category : Molecules
ISBN : 3731508192
We worked on different magnetic molecules containing 3d and 4f magnetic centers. Their growth on metallic surfaces, topographies, spin states, magnetic properties and electron transport were locally investigated by using scanning tunneling microscopy (STM) at temperatures down to 30mK. The main achievement of this dissertation reveals the abrupt switching of crystal fields during formation of molecular contacts.
Author : Jandke, Jasmin Maria
Publisher : KIT Scientific Publishing
Page : 242 pages
File Size : 40,74 MB
Release : 2019-05-02
Category : Physics
ISBN : 3731507471
Within this work, the pairing mechanism of conventional (Pb) and unconventional superconductors (SrFe2(As1-xPx )2 , FeSe, FeSe/STO) was investigated experimentally by means of elastic and inelastic tunneling spectroscopy at temperatures down to 30 mK. The distinction between elastic and inelastic contributions to tunneling data was elaborated. The results help to identify conventional (phonon-mediated) and unconventional (e.g. spin-?uctuation mediated) superconductivity.
Author : Jung, Philipp
Publisher : KIT Scientific Publishing
Page : 164 pages
File Size : 40,69 MB
Release : 2015-01-19
Category : Physics
ISBN : 3731502941
This thesis deals with the nonlinear aspects of superconducting quantum interference devices (SQUIDs) as magnetic meta-atoms. Such meta-atoms are usually resonant structures that constitute the basic building blocks of a metamaterial with the purpose of giving the material unconventional magnetic properties. Due to their intrinsic nonlinearity, SQUIDs exhibit a number of phenomena such as frequency tunability and multi-stability that make them attractive as controllable meta-atoms.
Author : Pfirrmann, Marco
Publisher : KIT Scientific Publishing
Page : 136 pages
File Size : 21,4 MB
Release : 2020-10-05
Category : Science
ISBN : 3731510030
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.
Author : Probst, Sebastian
Publisher : KIT Scientific Publishing
Page : 156 pages
File Size : 22,32 MB
Release : 2016-09-05
Category : Physics
ISBN : 373150345X
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.
Author : Wildermuth, Matthias Micha
Publisher : KIT Scientific Publishing
Page : 160 pages
File Size : 23,40 MB
Release : 2023-09-11
Category :
ISBN : 373151303X
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 : Edelmann, Kevin
Publisher : KIT Scientific Publishing
Page : 160 pages
File Size : 15,7 MB
Release : 2019-07-03
Category : Science
ISBN : 3731509237
This work presents the design and commissioning of a new low-temperature Scanning Tunnelling Microscope equipped with an innovative light collection setup using an integrated, micro-fabricated mirror tip. Commissioning experiments demonstrate the capabilities of this new instrument and reproduce known effects regarding gap plasmons on noble-metal surfaces. Furthermore, different contrasts in the plasmon-mediated light emission from Cobalt nano-islands on a Copper (111) substrate are reported.
