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Switchable selective interactions in a Dicke model with a driven biased term.

Ning Yu1, Shiran Wang1, Chunfang Sun1

  • 1Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, China.

Physical Review. E
|April 16, 2022
PubMed
Summary
This summary is machine-generated.

We present a method for controlling qubit-resonator interactions in a Dicke model, enabling the creation of specific quantum states. This control is achieved by tuning qubit-resonator coupling strength and modulation parameters.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • The Dicke model describes light-matter interactions, crucial for quantum technologies.
  • Controllable qubit-resonator interactions are key for quantum state engineering.
  • Nonlinearity in quantum systems enables advanced functionalities.

Purpose of the Study:

  • To investigate controllable qubit-resonator interactions within a driven Dicke model.
  • To understand the mechanism behind spectral nonlinearity induced by these interactions.
  • To demonstrate the creation of Dicke states and their superpositions.

Main Methods:

  • Unitary transformation of the Hamiltonian to analyze nonlinearity.
  • Frequency modulation approach to derive effective Hamiltonians.
  • Analysis of spectral nonlinearity dependence on qubit-resonator coupling strength.

Main Results:

  • Nonlinearity is directly dependent on qubit-resonator coupling strength.
  • Effective Hamiltonians allow for switching dynamical evolution.
  • Demonstrated creation of Dicke states and arbitrary superpositions.
  • Kerr-type nonlinearity observed in the thermodynamic limit via magnon-resonator coupling.

Conclusions:

  • The proposed method offers precise control over qubit-resonator interactions.
  • Controllable nonlinearity is essential for generating specific quantum states.
  • The findings are relevant for quantum information processing and quantum simulation.