All-optical charging and charge transport in quantum dots

Area of Science:

• Quantum technology
• Quantum photonics
• Solid-state physics

Background:

• Optically active quantum dots are key building blocks for quantum technology.
• Current quantum dot devices are limited to single dots, hindering complex applications.
• Individual charge control in multiple quantum dots remains a significant challenge.

Purpose of the Study:

• To propose and numerically demonstrate a novel method for controlled charging of multiple quantum dots.
• To enable efficient charge transport between quantum dots in an array.
• To advance the development of practical quantum photonic devices.

Main Methods:

• Utilizing an all-optical resonant manipulation scheme.
• Employing quantum dots with type-II band alignment (e.g., crystal-phase quantum dots in nanowires).
• Numerical simulations to validate the proposed method in realistic structures.

Main Results:

• Demonstrated controlled charging and charge transport in multiple quantum dots.
• Achieved high fidelities exceeding 99.9% in realistic structures.
• Validated the feasibility of the all-optical manipulation scheme.

Conclusions:

• The proposed method offers a practical solution for individually charging multiple quantum dots.
• This breakthrough facilitates the realization of advanced quantum photonic devices.
• Opens new avenues for solid-state quantum registers with photonic interfaces.