Integrating Normal-Metal Components into the Framework of Circuit Quantum Electrodynamics
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School of Science |
Doctoral thesis (article-based)
| Defence date: 2013-06-14
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Authors
Date
2013
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Mcode
Degree programme
Language
en
Pages
53 + app. 45
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 104/2013
Abstract
Superconducting quantum bits are one of the leading frontrunners in the race to build a solid-state quantum computer. In circuit quantum electrodynamics (cQED), electronic quantum circuits, playing the role of quantum bits, qubits, are placed into superconducting cavities with incredibly weak dissipation. The resulting system exhibits both photon and qubit characteristics, and it is possible to perform complex operations by driving the system with microwaves. Progress has been rapid, with vast improvements in cavities, qubits, and in controlling the interaction between the two. As a result, the first simple quantum algorithms to utilize this architecture have recently been implemented. At the same time, there have been significant developments in improving our understanding of the heat flow in nanoelectronics. In particular the development of tunnel junctions has reached such a level, that it is now possible to control and measure the temperature of small metal islands with high precision. Such techniques have enabled the first observations of quantum-limited heat conduction through the photonic modes of a circuit. This thesis introduces some of the benefits that come with the unification of these two fields. Theoretical models for experiments in a superconducting cavity are presented, with heat conduction due to individual cavity photons discussed in detail, along with a novel method to vary the lifetime of a qubit over many orders of magnitude. The realisation of these experiments would be the first steps on the road to integrating normal-metal components with cQED.Description
Supervising professor
Nieminen, Risto, Prof., Aalto University, FinlandThesis advisor
Möttönen, Mikko, Doc., Aalto University, FinlandKeywords
circuit quantum electrodynamics, photonic heat transport, remote heating and cooling, superconducting quantum bits
Other note
Parts
- [Publication 1]: Philip Jones, Jukka Huhtamäki, Kuan Yen Tan, and Mikko Möttönen. Single-photon heat conduction in electrical circuits. Physical Review B, 85, 075413, February 2012.
- [Publication 2]: Philip Jones, Jukka Huhtamäki, Matti Partanen, Kuan Yen Tan, and Mikko Möttönen. Tunable single-photon heat conduction in electrical circuits. Physical Review B, 86, 035313, May 2012.
- [Publication 3]: Philip Jones, Jukka Huhtamäki, Juha Salmilehto, Kuan Yen Tan, and Mikko Möttönen. Tunable electromagnetic environment for superconducting quantum bits. Submitted to Scientific Reports, April 2013.
- [Publication 4]: Philip Jones, Juha Salmilehto, and Mikko Möttönen. Highly controllable qubit-bath coupling based on a sequence of resonators. Submitted to Journal of Low Temperature Physics, April 2013.