Optical control of spectral diffusion with single InAs quantum dots in a silver-embedded nanocone

Area of Science:

• Quantum Optics
• Solid-State Physics
• Nanophotonics

Background:

• Spectral diffusion in quantum dots leads to fluctuations in emission energy.
• Indium arsenide (InAs) quantum dots are promising for quantum information applications.
• Nanostructure engineering can influence quantum dot optical properties.

Purpose of the Study:

• To investigate spectral diffusion in a single epitaxial InAs quantum dot.
• To explore methods for suppressing photoluminescence fluctuations.
• To analyze the quantum nature of the emission after stabilization.

Main Methods:

• Utilized stroboscopic detection of optical transitions.
• Employed strong illumination to suppress photoluminescence fluctuations.
• Analyzed photon statistics to characterize emission properties.

Main Results:

• Demonstrated temporal fluctuations in the peak energy of photoluminescence from an InAs quantum dot.
• Showed effective suppression of these fluctuations under strong illumination.
• Observed stable non-classical emission with strong anti-bunching after stabilization.

Conclusions:

• Strong illumination can stabilize spectral diffusion in InAs quantum dots.
• Stabilized quantum dot emission maintains non-classical properties.
• This technique enhances the suitability of quantum dots for quantum technologies.