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    Double quantum dot coupled to a radio-frequency single-electron transistor: Quantum measurement and back action

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    Author
    Thalakulam, Madhu
    Date
    2004
    Advisor
    Rimberg, Alexander J.
    Degree
    Master of Science
    Abstract
    The radio-frequency superconducting single electron transistor (RF-SET) is a highly sensitive and fast electrometer operating near the quantum limit. The back-action current noise of the SET induces voltage fluctuations on the system it is coupled to, dephasing its charge states. Here we propose to study the back action of the RF-SET by means of a double quantum dot (DQD) and, an RF-SET electrostatically coupled to one of the two dots. The inelastic current through the DQD is very sensitive to the spectral density of the voltage fluctuations in the nearby environment. By properly choosing the dot size and inter-dot tunnel barrier thickness, one can cause inelastic process to dominate the transport processes. A measurement of the inelastic current through the double dot system can then be used to calculate the spectral density of noise associated with the RF-SET and hence its back action. The design, fabrication and characterization of an RF-SET/DQD system is discussed in this work. Real-time studies of electron dynamics in coupled dots are also addressed.
    Keyword
    Electronics; Electrical engineering; Condensed matter physics
    Citation
    Thalakulam, Madhu. "Double quantum dot coupled to a radio-frequency single-electron transistor: Quantum measurement and back action." (2004) Master’s Thesis, Rice University. http://hdl.handle.net/1911/17737.
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    • Rice University Electronic Theses and Dissertations [12052]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892