Geometric spin echo under zero field.
Geometric spin echo under zero field.
复制标题
零场下的几何自旋回波。
DOI：
10.1038/ncomms11668
复制
发表时间：
2016-05-19
影响因子：
16.6
通讯作者：
Kosaka H
中科院分区：
文献类型：
--
作者：
Sekiguchi Y;Komura Y;Mishima S;Tanaka T;Niikura N;Kosaka H
自旋回波是量子寄存器和生物医学成像的基本工具。据信，自旋回波需要强磁场来提供长记忆和高分辨率，因为在零磁场下不能控制或寻址简并自旋。虽然简并尾旋永远不会受到动力学控制，但它仍然受到几何控制。在这里，我们显示了一个简并的自旋子系统，这是几何控制通过一个介导状态分裂的晶体场，在金刚石中的氮空位中心的自旋回波。演示表明，简并自旋是由称为零场分裂的固有对称性破缺保护的。零场下的几何自旋回波提供了一种理想的方法来保持相干性，而没有任何动力学，从而打开了通往伪静态量子随机存取存储器和非侵入式生物传感器的道路。 单自旋对局部环境的敏感性使它们成为未来量子信息和传感技术的有前途的组成部分。在这里，作者使用几何自旋回波来演示零外加场下金刚石中氮空位通过晶体场的控制。
Spin echo is a fundamental tool for quantum registers and biomedical imaging. It is believed that a strong magnetic field is needed for the spin echo to provide long memory and high resolution, since a degenerate spin cannot be controlled or addressed under a zero magnetic field. While a degenerate spin is never subject to dynamic control, it is still subject to geometric control. Here we show the spin echo of a degenerate spin subsystem, which is geometrically controlled via a mediating state split by the crystal field, in a nitrogen vacancy centre in diamond. The demonstration reveals that the degenerate spin is protected by inherent symmetry breaking called zero-field splitting. The geometric spin echo under zero field provides an ideal way to maintain the coherence without any dynamics, thus opening the way to pseudo-static quantum random access memory and non-invasive biosensors. The sensitivity of single spins to their local environment makes them promising components for future quantum information and sensing technology. Here, the authors use geometric spin echo to demonstrate the control of nitrogen-vacancies via the crystal field in diamond under zero applied fields.