• DOI:10.1103/PhysRevLett.126.047403
• Corpus ID: 221507651

Coherent Dynamics in Quantum Emitters under Dichromatic Excitation.

@article{Koong2020CoherentDI,
  title={Coherent Dynamics in Quantum Emitters under Dichromatic Excitation.},
  author={Zhe Xian Koong and Eleanor Scerri and Markus Rambach and Moritz Cygorek and Mauro Brotons-Gisbert and Reynald Boula Picard and Y. Ma and S. I. Park and Junliang Song and Erik M. Gauger and Brian D. Gerardot},
  journal={Physical review letters},
  year={2020},
  volume={126 4},
  pages={
          047403
        }
}

• Z. Koong, E. Scerri, +8 authors B. Gerardot
• Published 4 September 2020
• Physics
• Physical review letters

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. While 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, we find that any additional interactions that interfere with cancellation of the accumulated pulse area may lead to a finite stationary population inversion. Our spectroscopic results of a solid-state two-level system show that, while coupling to lattice vibrations helps to improve the inversion efficiency up to 50% under symmetric driving, coherent population control and a larger amount of inversion are possible using asymmetric dichromatic excitation, which we achieve by adjusting the ratio of the intensities between the red- and blue-detuned pulses. Our measured results, supported by simulations using a real-time path-integral method, offer a new perspective toward realizing efficient, background-free photon generation and extraction.