2026-09-19T13:10:13Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/454512022-01-13T07:54:41Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Terry P. Orlando and Mildred S. Dresselhaus.
Berns, David Marc
Massachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology. Department of Physics
2009-04-29T17:44:49Z
2009-04-29T17:44:49Z
2008
2008
http://hdl.handle.net/1721.1/45451
318328139
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 181-190).
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.
by David Marc Berns.
Ph.D.
190 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
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http://dspace.mit.edu/handle/1721.1/7582
Physics.
Large amplitude driving of a persistent current qubit
Thesis
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