Quantification of quantumness in neutrino oscillations
Quantification of quantumness in neutrino oscillations
复制标题
中微子振荡量子性的量化
DOI：
10.1140/epjc/s10052-020-7840-y
复制
发表时间：
2020
影响因子：
4.4
通讯作者：
Dong Wang
中科院分区：
文献类型：
--
作者：
Fei Ming;Xue-Ke Song;Jiajie Ling;Liu Ye;Dong Wang
中微子振荡是基本粒子物理中一种重要的物理现象，它的非经典特征可以通过莱格特-加格不等式来揭示。这表明它的量子相干性可以在天体物理长度尺度上持续存在。在这项工作中，我们通过量子相干（NAQC）、量子转向和贝尔非局域性的非局域优势，研究了实验观察到的中微子振荡中的量子测量。从不同的中微子源，在不同的能量，如大亚湾（0.5公里和1.6公里）和MINOS（735公里）协作分析了反应堆和加速器中微子的集合。对双味中微子振荡的NAQC进行了实验表征，并与理论预测进行了比较。随着能量的增加，它呈现出非单调的演化现象。进一步发现，即使在km数量级上，NAQC也比量子导向和Bell非定域性具有更强的量子相关性，因此，对于实现NAQC的任意二部中微子味态，它必须同时是可导向和Bell非定域性。该结果可能为进一步研究中微子振荡在量子信息处理中的应用提供新的思路。
Neutrino oscillation is an important physical phenomenon in elementary particle physics, and its nonclassical features can be revealed by the Leggett–Garg inequality. It shows that its quantum coherence can be sustained over astrophysical length scales. In this work, we investigate the measure of quantumness in experimentally observed neutrino oscillations via the nonlocal advantage of quantum coherence (NAQC), quantum steering, and Bell nonlocality. From various neutrino sources, ensembles of reactor and accelerator neutrinos are analyzed at distinct energies, such as Daya Bay (0.5 km and 1.6 km) and MINOS (735 km) collaborations. The NAQC of two-flavor neutrino oscillation is characterized experimentally compared to the theoretical prediction. It exhibits non-monotonously evolutive phenomenon with the increase of energy. Furthermore, it is found that the NAQC is a stronger quantum correlation than quantum steering and Bell nonlocality even in the order of km. Hence, for an arbitrary bipartite neutrino-flavor state with achieving a NAQC, it must be also a steerable and Bell nonlocal state. The results might offer an insight into the neutrino oscillation for the further applications on quantum information processing.