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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Circuit QED and sudden phase switching in a superconducting qubit array.

L Tian1

  • 1University of California, Merced, 5200 North Lake Road, Merced, California 95343, USA. ltian@ucmerced.edu

Physical Review Letters
|January 15, 2011
PubMed
Summary

Superconducting qubits in an array exhibit nonlinear behaviors, including phase switching and bistability between ferromagnetic and paramagnetic states. This study presents a circuit quantum electrodynamics system with realistic parameters for observation.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superconducting circuits

Background:

  • Superconducting qubits in arrays can model quantum many-body systems like the quantum Ising model.
  • Coupling qubits to superconducting resonators creates circuit quantum electrodynamics (circuit QED) systems.

Purpose of the Study:

  • To investigate the nonlinear behavior in the many-body state of a superconducting qubit array.
  • To explore the potential for phase switching and bistability in such systems.

Main Methods:

  • Utilized a semiclassical approach to analyze the many-body state of the qubit array.
  • Proposed a superconducting circuit design with realistic parameters for experimental implementation.

Main Results:

  • Observed sudden switching phenomena within the qubit array.
  • Identified a bistable regime exhibiting transitions between ferromagnetic and paramagnetic phases.

Conclusions:

  • Nonlinear dynamics, including phase transitions, are accessible in superconducting qubit arrays.
  • The proposed circuit QED system provides a viable platform for studying these quantum many-body phenomena.