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Related Experiment Videos

Cavity QED with semiconductor nanocrystals.

N Le Thomas1, U Woggon, O Schöps

  • 1Fachbereich Physik, Universität Dortmund, Otto-Hahn-Str. 4, 44227 Dortmund, Germany.

Nano Letters
|March 9, 2006
PubMed
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We achieved strong coupling in a novel cavity quantum electrodynamics (CQED) system using a CdSe nanocrystal and a polymer microsphere. This breakthrough enables new quantum optics studies and solid-state quantum information processing.

Area of Science:

  • Quantum Optics
  • Cavity Quantum Electrodynamics (CQED)
  • Nanophotonics

Background:

  • Cavity Quantum Electrodynamics (CQED) typically uses atoms as a quantum emitter.
  • Semiconductor nanocrystals offer tunable optical properties and large transition dipole moments.
  • Integrating nanocrystals into optical cavities is crucial for advanced quantum applications.

Purpose of the Study:

  • To demonstrate strong coupling between a CdSe nanocrystal exciton and a polymer microsphere cavity.
  • To explore the potential of colloidal semiconductor nanocrystals in visible-light CQED systems.
  • To pave the way for solid-state quantum information processing in the visible spectrum.

Main Methods:

  • Fabrication of a polymer microsphere cavity with a single, isolated photon mode.

Related Experiment Videos

  • Coupling of an anisotropically shaped CdSe nanocrystal exciton to the cavity mode.
  • High-resolution imaging spectroscopy to address and analyze the coupled system.
  • Measurement of cavity mode splitting and photon lifetimes to confirm strong coupling.

    • Main Results:

    • Observation of cavity mode splitting (30-45 microeV) indicating strong exciton-photon coupling.
    • Demonstration of efficient coupling between the CdSe exciton and the polymer microsphere cavity mode.
    • Characterization of the coupled exciton-photon state's photon lifetime.

    Conclusions:

    • Strong coupling is achieved in a colloidal semiconductor nanocrystal-cavity system.
    • CdSe nanocrystals are viable quantum emitters for visible-light CQED.
    • This system opens avenues for fundamental quantum optics research and solid-state quantum information processing.