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Broken selection rule in the quantum Rabi model.

P Forn-Díaz1,2, G Romero3, C J P M Harmans2

  • 1Institute for Quantum Computing, Department of Physics and Astronomy, and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, N2L 3G1, Canada.

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This summary is machine-generated.

Researchers observed a unique quantum transition in superconducting circuits, breaking established selection rules. This discovery in the ultrastrong coupling regime of the quantum Rabi model opens new avenues for quantum technology development.

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Area of Science:

  • Quantum Optics and Photonics
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • The quantum Rabi model describes light-matter interactions, crucial for quantum electrodynamics and quantum technologies.
  • Understanding coupling regimes is key to controlling quantum systems and developing new quantum devices.

Purpose of the Study:

  • To spectroscopically observe a resonant transition that violates selection rules within the quantum Rabi model.
  • To investigate the behavior of quantum systems in the ultrastrong coupling regime.

Main Methods:

  • Implementation of the quantum Rabi model using a superconducting qubit coupled to an LC resonator.
  • Spectroscopic analysis to detect transitions in the ultrastrong coupling regime (coupling strength ~10% of resonator frequency).

Main Results:

  • Observation of sign-changing transitions, which are forbidden under standard sign-preserving selection rules.
  • Demonstration that these sign-changing transitions are a signature of the ultrastrong coupling regime.

Conclusions:

  • Sign-changing transitions provide an unambiguous signature for systems operating in the ultrastrong coupling regime of the quantum Rabi model.
  • This research paves the way for exploring sign-preserving selection rules in more complex quantum systems, like multi-qubit and multi-photon models.