Coherent Dynamics in Quantum Emitters under Dichromatic Excitation

Understand

We characterize the coherent dynamics of a two-level quantum emitter driven by a pair of symmetrically-detuned phase-locked pulses.

• The promise of dichromatic excitation is to spectrally isolate the excitation laser from the quantum emission, enabling background-free photon extraction from the emitter.
• Paradoxically, we find that excitation is not possible without spectral overlap between the exciting pulse and the quantum emitter transition for ideal two-level systems due to cancellation of the accumulated pulse area.
• However, any additional interactions that interfere with cancellation of the accumulated pulse area may lead to a finite stationary population inversion.