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Experiments on Flux Qubits with Pi-shifters

Experiments on Flux Qubits with Pi-shifters
Author: Alexey Feofanov
Publisher: KIT Scientific Publishing
Total Pages: 126
Release: 2014-08-20
Genre: Science
ISBN: 3866446446

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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.


Quantum Sensing Experiments with Superconducting Qubits

Quantum Sensing Experiments with Superconducting Qubits
Author: Schneider, Andre
Publisher: KIT Scientific Publishing
Total Pages: 170
Release: 2021-06-04
Genre: Science
ISBN: 3731510324

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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.


Nonlinear Effects in Superconducting Quantum Interference Meta-Atoms

Nonlinear Effects in Superconducting Quantum Interference Meta-Atoms
Author: Jung, Philipp
Publisher: KIT Scientific Publishing
Total Pages: 164
Release: 2015-01-19
Genre: Physics
ISBN: 3731502941

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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.


Adding nonlinearity to an electromagnetic-magnonic quantum hybrid device

Adding nonlinearity to an electromagnetic-magnonic quantum hybrid device
Author: Pfirrmann, Marco
Publisher: KIT Scientific Publishing
Total Pages: 136
Release: 2020-10-05
Genre: 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.


Quantum Tunneling of Josephson Vortices in High-Impedance Long Junctions

Quantum Tunneling of Josephson Vortices in High-Impedance Long Junctions
Author: Wildermuth, Matthias Micha
Publisher: KIT Scientific Publishing
Total Pages: 160
Release: 2023-09-11
Genre:
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.