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arXiv 2501.14656cond-mat.mes-hall
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二维材料量子发射体中声子寿命对单光子不可分辨性的影响

Impact of phonon lifetimes on the single-photon indistinguishability in quantum emitters based on 2D materials

Alexander Steinhoff, Steffen Wilksen, Ivan Solovev, Christian Schneider, Christopher Gies

AI总结:

本文通过求解全量子力学方程,量化了激子-声子相互作用和腔QED效应对二维材料量子发射体单光子不可分辨性的影响,发现有限声子寿命引起的纯退相干显著降低了光子相干性。

摘要:

二维材料中的局域激子被认为是按需单光子的理想来源。光子不可分辨性作为量子信息处理的关键品质因数,受电荷激发与周围半导体材料晶格振动耦合的强烈影响。在此,我们通过求解包含非马尔可夫效应的耦合QD-腔-声子系统全量子力学方程,量化了激子-声学声子相互作用和腔QED效应对Hong-Ou-Mandel装置中光子不可分辨性的影响。我们发现,由于激子-声子耦合效率增加,其不可分辨性较3D系统显著降低。此外,我们表明光子的相干性受到周围材料中有限声子寿命的显著影响,从而引起纯退相干。只有克服这些限制,二维半导体中的局域激子才能成为量子光源的新途径。

英文摘要:

Localized excitons in two-dimensional (2D) materials are considered as promising sources of single photons on demand. The photon indistinguishability as key figure of merit for quantum information processing is strongly influenced by the coupling of charge excitations to lattice vibrations of the surrounding semiconductor material. Here, we quantify the impact of exciton-acoustic-phonon-interaction and cavity QED effects on photon indistinguishability in a Hong-Ou-Mandel setup by solving fully quantum mechanical equations for the coupled QD-cavity-phonon system including non-Markovian effects. We find a strong reduction of indistinguishability compared to 3D systems due to increased exciton-phonon coupling efficiency. Moreover, we show that the coherence properties of photons are significantly influenced by the finite phonon lifetime in the surrounding material giving rise to pure dephasing. Only if these limitations are overcome, localized excitons in 2D semiconductors can become a new avenue for quantum light sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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