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arXiv 2009.02121quant-phcond-mat.mes-hall
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双色激发下量子发射体的相干动力学

Coherent Dynamics in Quantum Emitters under Dichromatic Excitation

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

摘要:

我们研究了在一对双失谐锁相脉冲驱动下二能级量子发射体的相干动力学。二色激发的前景是在光谱上将激发激光与量子发射隔离,从而实现从发射器的无背景光子提取。反常地,我们发现,激发是不可能的,没有光谱之间的重叠的激发脉冲和量子发射跃迁的理想的二能级系统,由于取消的累积脉冲面积。然而,干扰累积脉冲面积的消除的任何附加相互作用可能导致有限的稳态粒子数反转。我们的固态两能级系统的光谱结果表明,虽然耦合到晶格振动有助于提高反转效率高达50%的对称驱动下,相干粒子数控制和更大量的反转是可能的使用非对称双色激发,我们通过调整红色和蓝色失谐脉冲之间的强度比。我们的测量结果,支持使用实时路径积分方法的模拟,提供了一个新的视角,实现高效,无背景的光子产生和提取。

英文摘要:

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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