Coherent Dynamics in Quantum Emitters under Dichromatic Excitation
- URL: http://arxiv.org/abs/2009.02121v1
- Date: Fri, 4 Sep 2020 11:52:39 GMT
- Title: Coherent Dynamics in Quantum Emitters under Dichromatic Excitation
- Authors: Z. X. Koong, E. Scerri, M. Rambach, M. Cygorek, M. Brotons-Gisbert, R.
Picard, Y. Ma, S. I. Park, J. D. Song, E. M. Gauger, B. D. Gerardot
- Abstract 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.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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.
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