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Vacuum Rabi splitting in a semiconductor circuit QED system.

H Toida1, T Nakajima, S Komiyama

  • 1Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Tokyo 153-8902, Japan. toida@thz.c.u-tokyo.ac.jp

Physical Review Letters
|February 26, 2013
PubMed
Summary
This summary is machine-generated.

Vacuum Rabi splitting was observed in a GaAs quantum dot system. This demonstrates strong coupling between the quantum dot and resonator, with decoherence linked to electron-phonon interactions.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Materials science

Background:

  • Quantum dots offer tunable electronic properties for quantum information processing.
  • Strong coupling regimes are crucial for observing quantum phenomena like Vacuum Rabi splitting.
  • Gallium Arsenide (GaAs) is a key material in semiconductor research.

Purpose of the Study:

  • To demonstrate and characterize Vacuum Rabi splitting in a GaAs double quantum dot system.
  • To investigate the strong coupling regime between a quantum dot and a resonator.
  • To understand the decoherence mechanisms in the system.

Main Methods:

  • Fabrication of a GaAs double quantum dot system.
  • Coupling the quantum dot to a coplanar waveguide resonator.
  • Experimental measurement and derivation of coupling strength (g), decoherence rate (γ), and resonator decay rate (κ).

Main Results:

  • Demonstration of distinct Vacuum Rabi oscillation in the strong coupling regime.
  • Quantification of system parameters: (g,γ,κ) ≈ (30, 25, 8.0) MHz.
  • Interpretation of decoherence magnitude attributed to electron-piezoelectric acoustic phonon coupling.

Conclusions:

  • The GaAs double quantum dot coupled to a resonator exhibits strong coupling, evidenced by Vacuum Rabi splitting.
  • Electron-phonon interactions are identified as a significant source of decoherence in this system.
  • The findings contribute to the development of quantum technologies using semiconductor-based qubits.