TY - JOUR TI - Coherent Dynamics in Quantum Emitters under Dichromatic Excitation AU - Koong, Z. X. AU - Scerri, E. AU - Rambach, M. AU - Cygorek, M. AU - Brotons-Gisbert, M. AU - Picard, R. AU - Ma, Y. AU - Park, S. I. AU - Song, J. D. AU - Gauger, E. M. AU - Gerardot, B. D. T2 - arXiv:2009.02121 [cond-mat, physics:quant-ph] AB - 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. 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 towards realising efficient, background-free photon generation and extraction. DA - 2020/09/04/ PY - 2020 DP - arXiv.org UR - http://arxiv.org/abs/2009.02121 Y2 - 2020/09/09/07:50:12 KW - Brian Gerardot KW - Condensed Matter - Mesoscale and Nanoscale Physics KW - QPL KW - Quantum Physics KW - quantum emitter ER -