Robust quantum dot state preparation via adiabatic passage with frequency-swept optical pulses

TL;DR

This paper demonstrates a robust method for preparing quantum states in semiconductor quantum dots using frequency-swept optical pulses that employ rapid adiabatic passage, enhancing control over quantum coherence.

Contribution

It introduces a novel optical technique utilizing frequency-swept pulses for robust quantum state preparation via adiabatic passage in quantum dots.

Findings

Successful implementation of rapid adiabatic passage in quantum dots.

Enhanced robustness in quantum state preparation.

Novel optical detection scheme for exciton generation.

Abstract

The energy states in semiconductor quantum dots are discrete as in atoms, and quantum states can be coherently controlled with resonant laser pulses. Long coherence times allow the observation of Rabi-flopping of a single dipole transition in a solid state device, for which occupancy of the upper state depends sensitively on the dipole moment and the excitation laser power. We report on the robust preparation of a quantum state using an optical technique that exploits rapid adiabatic passage from the ground to an excited state through excitation with laser pulses whose frequency is swept through the resonance. This observation in photoluminescence experiments is made possible by introducing a novel optical detection scheme for the resonant electron hole pair (exciton) generation.