• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Cat-state generation and stabilization for a nuclear spin through electric quadrupole interaction

      Thumbnail
      View / Download
      1.5 Mb
      Author
      Bulutay C.
      Date
      2017
      Source Title
      Physical Review A
      Print ISSN
      24699926
      Publisher
      American Physical Society
      Volume
      96
      Issue
      1
      Language
      English
      Type
      Article
      Item Usage Stats
      64
      views
      60
      downloads
      Metadata
      Show full item record
      Abstract
      Spin cat states are superpositions of two or more coherent spin states (CSSs) that are distinctly separated over the Bloch sphere. Additionally, the nuclei with angular momenta greater than 1/2 possess a quadrupolar charge distribution. At the intersection of these two phenomena, we devise a simple scheme for generating various types of nuclear-spin cat states. The native biaxial electric quadrupole interaction that is readily available in strained solid-state systems plays a key role here. However, the fact that built-in strain cannot be switched off poses a challenge for the stabilization of target cat states once they are prepared. We remedy this by abruptly diverting via a single rotation pulse the state evolution to the neighborhood of the fixed points of the underlying classical Hamiltonian flow. Optimal process parameters are obtained as a function of electric field gradient biaxiality and nuclear-spin angular momentum. The overall procedure is seen to be robust under 5% deviations from optimal values. We show that higher-level cat states with four superposed CSS can also be formed using three rotation pulses. Finally, for open systems subject to decoherence we extract the scaling of cat-state fidelity damping with respect to the spin quantum number. This reveals rates greater than the dephasing of individual CSSs. Yet, our results affirm that these cat states can preserve their fidelities for practically useful durations under the currently attainable decoherence levels. © 2017 American Physical Society.
      Keywords
      Angular distribution
      Angular momentum
      Electric fields
      Spin dynamics
      Stabilization
      Coherent spin state
      Electric field gradients
      Electric quadrupole interactions
      Hamiltonian flows
      Single rotations
      Solid-state system
      Spin quantum number
      State evolutions
      Quantum theory
      Permalink
      http://hdl.handle.net/11693/37145
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevA.96.012312
      Collections
      • Department of Physics 2149

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University | Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin