Coherent Dynamics in Quantum Emitters under Dichromatic Excitation

Area of Science:

• Quantum Optics
• Solid-State Physics

Background:

• Dichromatic excitation offers background-free photon extraction by spectrally isolating excitation lasers.
• Ideal two-level systems typically require spectral overlap for excitation, posing challenges for dichromatic methods.
• Interactions interfering with pulse area cancellation can lead to population inversion.

Purpose of the Study:

• To investigate the coherent dynamics of a two-level quantum emitter under dichromatic excitation.
• To explore methods for achieving population inversion and efficient photon extraction.
• To compare symmetric and asymmetric dichromatic driving schemes.

Main Methods:

• Characterization of coherent dynamics using phase-locked, detuned laser pulses.
• Spectroscopic analysis of a solid-state two-level system.
• Real-time path-integral simulations for theoretical support.

Main Results:

• Symmetric dichromatic driving with lattice vibrations improved inversion efficiency up to 50%.
• Asymmetric dichromatic excitation, by adjusting pulse intensity ratios, enabled greater coherent population control and inversion.
• Experimental results align with theoretical simulations.

Conclusions:

• Asymmetric dichromatic excitation is a promising strategy for efficient, background-free photon generation.
• Coherent population control can be enhanced by manipulating excitation pulse parameters.
• This work provides a new perspective for advanced quantum optical applications.