Electrically-Pumped Wavelength-Tunable GaAs Quantum Dots Interfaced with Rubidium Atoms

Area of Science:

• Quantum optics and photonics
• Atomic physics and quantum information science

Background:

• Development of reliable sources for nonclassical light is crucial for quantum technologies.
• Resonance with atomic transitions, such as the D2 line of Rubidium-87 (⁸⁷Rb), is key for interfacing light and matter in quantum systems.

Purpose of the Study:

• To demonstrate the first wavelength-tunable, electrically pumped source of nonclassical light.
• To achieve photon emission resonant with ⁸⁷Rb D2 transitions.
• To explore the integration of such a source with atomic vapors for quantum applications.

Main Methods:

• Fabrication of a novel Gallium Arsenide (GaAs) single-quantum-dot light-emitting diode (LED).
• Integration of the GaAs quantum-dot LED onto a piezoelectric actuator for wavelength tuning.
• Coupling the emitted photons into a cell containing warm ⁸⁷Rb vapor to observe slow-light phenomena.

Main Results:

• Successful demonstration of a wavelength-tunable, electrically pumped source of nonclassical light.
• Achieved photon emission precisely tuned to the D2 transitions of ⁸⁷Rb atoms.
• Observed slow-light with a significant temporal delay of up to 3.4 nanoseconds (ns) in the ⁸⁷Rb vapor.

Conclusions:

• This work presents a significant step towards hybrid quantum systems by enabling tunable nonclassical light sources.
• The ability to generate photons resonant with ⁸⁷Rb atoms, combined with observed slow-light effects, is promising for quantum memory applications.
• The developed device is a key enabler for future quantum networks integrating solid-state emitters and atomic systems.