Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots
Hyperfine interaction limits polarization entanglement of photons from semiconductor quantum dots
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DOI：
10.1103/physrevb.108.l081405
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发表时间：
2023-02
影响因子：
3.7
通讯作者：
C. Schimpf;F. B. Basset;Maximilian Aigner;Wolfgang Attenender;L. Ginés;G. Undeutsch;M. Reindl;D. Huber;D. Gangloff;E. Chekhovich;C. Schneider;S. Höfling;A. Predojevič;R. Trotta;A. Rastelli
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文献类型：
--
作者：
C. Schimpf;F. B. Basset;Maximilian Aigner;Wolfgang Attenender;L. Ginés;G. Undeutsch;M. Reindl;D. Huber;D. Gangloff;E. Chekhovich;C. Schneider;S. Höfling;A. Predojevič;R. Trotta;A. Rastelli
量子点中的激子是极化纠缠光子对的极好来源，但它们与核自旋浴相互作用的定量理解仍然缺失。在这里，我们利用实验可获得的参数研究了超精细能量位移的作用，并推导了可实现的纠缠保真度的上限。我们的结果与所有现有文献一致，表明自旋噪声通常是限制InGaAs量子点纠缠的主要过程，并提出了减轻其影响的途径。
Excitons in quantum dots are excellent sources of polarization-entangled photon pairs, but a quantitative understanding of their interaction with the nuclear spin bath is still missing. Here we investigate the role of hyperfine energy shifts using experimentally accessible parameters and derive an upper limit to the achievable entanglement fidelity. Our results are consistent with all available literature, indicate that spin-noise is often the dominant process limiting the entanglement in InGaAs quantum dots, and suggest routes to alleviate its effect.