Quantum Metrology with Strongly Interacting Spin Systems
Quantum Metrology with Strongly Interacting Spin Systems
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DOI：
10.1103/physrevx.10.031003
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Hengyun Zhou;Joonhee Choi;Soonwon Choi;R. Landig;Alexander M. Douglas;J. Isoya;F. Jelezko;S. Onoda;H. Sumiya;P. Cappellaro;H. Knowles;Hongkun Park;M. Lukin
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文献类型：
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作者：
Hengyun Zhou;Joonhee Choi;Soonwon Choi;R. Landig;Alexander M. Douglas;J. Isoya;F. Jelezko;S. Onoda;H. Sumiya;P. Cappellaro;H. Knowles;Hongkun Park;M. Lukin
量子计量学利用相干叠加来检测微弱信号。虽然原则上可以通过增加敏感粒子的密度来提高灵敏度，但在实践中，它们之间的相互作用严重阻碍了这种提高。利用钻石中密集的相互作用的电子自旋系综，我们展示了一种新的量子计量方法。它基于一种新的稳健量子控制方法，使我们能够同时消除与自旋-自旋相互作用、无序和控制缺陷相关的不良影响，使相干时间比传统控制序列提高五倍。与优化的初始化和读出协议相结合，这使我们能够打破由相互作用造成的交流磁场检测的限制，为开发具有前所未有的灵敏度的固态系综磁强计开辟了一条充满希望的道路。
Quantum metrology makes use of coherent superpositions to detect weak signals. While in principle the sensitivity can be improved by increasing the density of sensing particles, in practice this improvement is severely hindered by interactions between them. Using a dense ensemble of interacting electronic spins in diamond, we demonstrate a novel approach to quantum metrology. It is based on a new method of robust quantum control, which allows us to simultaneously eliminate the undesired effects associated with spin-spin interactions, disorder and control imperfections, enabling a five-fold enhancement in coherence time compared to conventional control sequences. Combined with optimal initialization and readout protocols, this allows us to break the limit for AC magnetic field sensing imposed by interactions, opening a promising avenue for the development of solid-state ensemble magnetometers with unprecedented sensitivity.