#lk99 牛剑渣/洗老师/罗教授的论文出来了。这下可以大喊超导了！
#lk99 牛剑渣/洗老师/罗教授的论文出来了。这下可以大喊超导了！
铜取代的磷酸铅中低质量导电电子的长程相干配对
在量子控制领域，两个相互纠缠的量子位被认为是一种必不可少的资源，通常要求以原子级精度进行限制。然而，在宏观范围内，集体量子位对展示了长时间的相干性和量子纠缠效应，尤其是在高温下，这似乎是一种令人担忧的制约因素。在这项研究中，我们报道了在以铜取代的固体烧结磷酸铅样品中观察到的这种奇特集体效应。通过重复制备，我们获得了这种效应的稳定性，并且成本较低。连续波电子顺磁共振（EPR）光谱观测到的异常低场吸收信号来源于低质量导电电子，这暗示了铜酸盐自由基的相干性可以得到长期保护。在脉冲EPR实验中，我们观察到了成对的铜酸盐双自由基的三重拉比振荡，相干时间在85K下超过1微秒。我们相信这些吸引人的结果足以在可扩展的量子控制和计算中应用。
Long-coherence pairing of low-mass conduction electrons in copper-substituted lead apatite
Jicheng Liu, Chenao He, Yin-Hui Peng, Zhihao Zhen, Guanhua Chen, Jia Wang, Xiao-Bao Yang, Xianfeng Qiao, Yao Yao, Dongge Ma
Two entangled qubits emerge as an essential resource for quantum control, which are normally quantum confined with atomic precision. It seems inhibitive that in the macroscopic scope collective qubit pairs manifest long coherence and quantum entanglement, especially at high temperature. Here, we report this exotic ensemble effect in solid-state sintering lead apatite samples with copper substitution, which have been repeatedly duplicated with superior stability and low cost. An extraordinarily low-field absorption signal of cw electron paramagnetic resonance (EPR) spectroscopy stems from low-mass conduction electrons implying the coherence of cuprate radicals can be long-termly protected. The pulsed EPR experiments exhibit triplet Rabi oscillation from paired cuprate diradicals with the coherence time exceeding 1 microsecond at 85K. We believe these appealing effects are sufficiently promising to be applied for scalable quantum control and computation.
momo 的帖子
洗老师的补充说明
> 接近零场的吸收，意味着自发打开了一个9GHz左右的能隙，再综合前面说的小质量传导电子峰、双自由基长相干配对等特征，好像所有结果都指向了同一个惊人的结论：
>
> 一维拓扑超导体。
>
> 我想了几天几夜也没敢下这个结论，实在太匪夷所思了。但除了这个解释，我想来想去，其它可能的解释都只会更离奇、更玄学。
