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      Quantum bistability, structural transformation, and spontaneous persistent currents in mesoscopic aharonov-bohm loops

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      Author(s)
      Kulik, I. O.
      Date
      2005
      Source Title
      Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation
      Publisher
      World Scientific Publishing Co.
      Pages
      37 - 42
      Language
      English
      Type
      Book Chapter
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      Abstract
      Fixed-number-of-electron mesoscopic or macromolecular conducting ring is shown to support persistent currents due to Aharonov-Bohm flux, and the "spontaneous" persistent currents without the flux when structural transformation in the ring is blocked by strong coupling to the externally azimuthal-symmetric environment. In the free-standing macromolecular ring, symmetry breaking removes the azimuthal periodicity which however is further restored at the increasing field. Three-site ring with one or three electrons represent an interesting quantum system which can serve as a qubit (quantum bit of information) and a qugate (quantum logical gate). © 2005 by World Scientific Publishing Co. Pte. Ltd.
      Keywords
      Macromolecules
      Quantum computers
      Quantum optics
      Aharonov-Bohm flux
      Conducting ring
      Fixed numbers
      Persistent currents
      Quantum system
      Strong coupling
      Structural transformation
      Symmetry-breaking
      Superconducting materials
      Permalink
      http://hdl.handle.net/11693/37824
      Published Version (Please cite this version)
      http://dx.doi.org/10.1142/9789812701619_0006
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      • Department of Physics 2550
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