Koong, Z. X. Scerri, E. Rambach, M. Cygorek, M. Brotons-Gisbert, M. Picard, R. Ma, Y. Park, S., I Song, J. D. Gauger, E. M. Gerardot, B. D. 2024-01-19T15:32:43Z 2024-01-19T15:32:43Z 2022-01-10 2021-01-26 0031-9007 https://pubs.kist.re.kr/handle/201004/117502 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. English AMER PHYSICAL SOC Coherent Dynamics in Quantum Emitters under Dichromatic Excitation Article 10.1103/PhysRevLett.126.047403 1 PHYSICAL REVIEW LETTERS, v.126, no.4 PHYSICAL REVIEW LETTERS 126 4 scie scopus 000612144200010 2-s2.0-85100240969 Physics, Multidisciplinary Physics Article Quantum Emitters Dichromatic Excitation Coherent Dynamics