AI 中文总结
研究轻子对撞机产生的高能光子，通过\(e^+e^- \to \gamma\gamma\)和\(e^+e^- \to e^+e^-\gamma\)过程中的单双转换测量量子信息，以 Belle-II 探测器为例展示可探测双光子系统量子相关性及相关物理量。
AI 中文摘要
我们研究轻子对撞机产生的在探测器中转换为\(e^+e^-\)对的高能光子，将其作为测量量子信息可观测量的工具。我们考虑\(e^+e^- \to \gamma\gamma\)和\(e^+e^- \to e^+e^-\gamma\)中的单转换和双转换过程。单转换能原位提取自旋分析能力，双转换探测极化相关性。以 Belle-II 探测器为例，表明根据转换\(e^+e^-\)对张角的重建分辨率，可探测双光子系统的量子相关性。特别是能以高显著性测量贝尔不等式违背、量子失协、并发度、非稳定性和 steerability 等，涉及空间分离的 GeV 尺度光子。
英文摘要
We study high-energy photons produced at a lepton collider that convert into an $e^+e^-$ pair in the detector, as a tool for measuring quantum information observables. We consider single- and double-conversion processes in $e^+e^- \to γγ$ and $e^+e^- \to e^+e^-γ$. Single conversions enable an in situ extraction of the spin-analyzing power, while double conversions probe polarization correlations. Focusing on the Belle-II detector, we show that, depending on the reconstruction resolution of the opening angle of the conversion $e^+e^-$ pair, quantum correlations of the diphoton system can be probed. In particular, measurements of violations of the Bell inequality, quantum discord, concurrence, nonstabilizerness, and steerability with spatially separated GeV-scale photons can be made at high significance.
Comments14 pages, 8 figures
