Large amplitude driving of a persistent current qubit
Name
318328139-MIT.pdf
Description
Full printable version
Size
63.08 MB
Format
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Checksum (MD5)
4451a9e69c5ab9268bd5a3524665e8d7
Author(s)
Berns, David Marc
Advisor(s)
Terry P. Orlando and Mildred S. Dresselhaus.
Date Issued
2008
Publisher
Massachusetts Institute of Technology
Abstract
In this thesis, the persistent current qubit in the presence of large amplitude microwave radiation is studied. Three main results are presented in this work. A new coherent quasi classical regime has been observed, where coherent quantum dynamics persist even while transitions between energy levels are caused by many photon modes simultaneously. A new theoretical treatment of this regime has been developed, and remarkable agreement between theory and experiment is observed. Also presented is a novel application of strong driving, where unwanted excited state population is cooled to the ground state by utilizing a second avoided crossing. This method of cooling, via a third, ancillary qubit level, is analogous to atomic sideband cooling. Cooling from 400mK to 3mK has been achieved. Finally, a new type of spectroscopy is presented, where an entire manifold of quantum levels is characterized with a single driving frequency, by studying the amplitude dependence of the qubit's behavior. Characterization of energy level spacings reaching 120GHz is achieved with radiation on the order of 0.1GHz.
Description
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 181-190).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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