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Quantum phases in circuit QED with a superconducting qubit array.

Yuanwei Zhang1, Lixian Yu2, J-Q Liang3

  • 11] Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, P. R. China [2] State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser spectroscopy, Shanxi University, Taiyuan 030006, P. R. China.

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Summary
This summary is machine-generated.

Researchers explored a Dicke-Ising model in circuit quantum electrodynamics (QED), revealing four quantum phases. New antiferromagnetic phases were discovered, showcasing coexisting orders and unique photon signatures.

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Area of Science:

  • Quantum physics
  • Many-body physics
  • Circuit Quantum Electrodynamics (QED)

Background:

  • Circuit QED is a powerful platform for simulating complex many-body physics.
  • Superconducting qubit arrays enable the realization of advanced quantum models.

Purpose of the Study:

  • To realize and investigate a Dicke-Ising model with antiferromagnetic interactions in circuit QED.
  • To predict and characterize novel quantum phases arising from competing interactions.

Main Methods:

  • Implementation of a Dicke-Ising model using a superconducting qubit array in a circuit QED architecture.
  • Theoretical analysis of the interplay between collective spin-photon interaction and nearest-neighbor spin-spin interaction.

Main Results:

  • Prediction of four distinct quantum phases: paramagnetic normal, antiferromagnetic normal, paramagnetic superradiant, and antiferromagnetic superradiant.
  • Identification of the antiferromagnetic normal and superradiant phases as new contributions to many-body quantum optics.
  • Observation of coexisting antiferromagnetic and superradiant orders in the antiferromagnetic superradiant phase, exhibiting Z(z)₂ ⊗ Z₂ symmetry.
  • Discovery of an unconventional photon signature within the antiferromagnetic superradiant phase.

Conclusions:

  • The competition between spin-photon and spin-spin interactions leads to rich quantum phase diagrams.
  • The newly predicted phases, particularly the antiferromagnetic superradiant phase, offer new avenues for exploring quantum phenomena.
  • Future experiments can distinguish these phases by measuring mean-photon number and magnetization.