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Parity-Symmetry-Protected Multiphoton Bundle Emission.

Qian Bin1, Ying Wu1, Xin-You Lü1

  • 1School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

Physical Review Letters
|August 30, 2021
PubMed
Summary
This summary is machine-generated.

We show how to generate bundles of correlated photons using cavity quantum electrodynamics (QED) in the ultrastrong coupling regime. This method utilizes parity symmetry to enable even-photon emissions while suppressing odd-photon emissions.

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Area of Science:

  • Quantum optics
  • Cavity Quantum Electrodynamics (QED)
  • Solid-state physics

Background:

  • Multiphoton emission is crucial for quantum technologies.
  • Achieving controlled multiphoton generation in the ultrastrong coupling regime remains challenging.
  • Symmetry principles offer a powerful tool for controlling quantum phenomena.

Purpose of the Study:

  • To demonstrate symmetry-protected multiphoton bundle emission.
  • To explore the ultrastrong coupling regime in cavity QED systems.
  • To leverage parity symmetry for enhanced photon correlations and purity.

Main Methods:

  • Utilizing a cavity QED system operating in the ultrastrong coupling regime.
  • Implementing laser-driven qubit flips combined with Rabi interactions.
  • Exploiting parity symmetry for controlled photon generation.
  • Incorporating dissipation to filter emission characteristics.

Main Results:

  • Achieved super-Rabi oscillations with periodic generation of even correlated photons.
  • Demonstrated suppression of odd correlated photon bundle emissions.
  • Significantly enhanced the purity of the generated photon bundles via parity symmetry.
  • Extended multiphoton bundle emission to the ultrastrong coupling regime.

Conclusions:

  • Symmetry protection provides a viable route for generating specific multiphoton states.
  • The proposed method enables robust and pure even-photon bundle emission.
  • Opens new avenues for exploring symmetry-protected quantum phenomena in cavity QED.