Coherent Dynamics in Quantum Emitters under Dichromatic Excitation

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 emitt...

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Bibliographic Details
Published in:Physical review letters 2021-01, Vol.126 (4), p.047403-047403, Article 047403
Main Authors: 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
Format: Article
Language:English
Subjects:
Coherence
Emitters
Excitation spectra
Lattice vibration
Photons
Population control
Population inversion
Spectral emittance
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.047403