Engineering of Quantum Emitter Properties

Solid-state quantum emitters, particularly semiconductor quantum dots, are promising photon sources for quantum technologies. However, their interaction with phonons dampen the Rabi oscillations under resonant driving, leading to reduced state preparation fidelities. The phonon spectral density, a quantity for the carrier-phonon interaction strength, is a non-monotonic function in energy. This leads to the reappearance of Rabi rotation for high pulse powers, which was theoretically predicted in PRL 98, 227403 (2007).
Here, we experimentally demonstrate the reappearance of Rabi rotations by resonantly driving the negative trion transition in a GaAs quantum dot, obtained by local droplet-etching-epitaxy, using a few-picosecond laser pulse.