Dynamical decoupling of a single-electron spin at room temperature
Dynamical decoupling of a single-electron spin at room temperature
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DOI：
10.1103/physrevb.83.081201
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发表时间：
2011-02-02
影响因子：
3.7
通讯作者：
Wrachtrup, Joerg
中科院分区：
文献类型：
--
作者：
Naydenov, Boris;Dolde, Florian;Wrachtrup, Joerg
本文报道了利用动态解耦方法提高室温下单电子自旋的相干时间T(2)。我们证明，与哈恩回波测量的T(2) = 400 μ s相比，carr - pur细胞- meiboomm - gill （CPMG）脉冲序列可以将金刚石中单个氮空位中心的T(2)延长至2.44 ms。此外，通过进行自旋锁定实验，我们证明CPMG达到了最大可能的T(2)。另一方面，我们没有观察到纳米金刚石中相干时间的明显增加，这可能是由于自旋晶格弛豫时间T(1) = 100 μ s较短（与体中的T(1) = 5.93 ms相比）。在低磁场的探测应用中，我们证明了CPMG方法的灵敏度比Hahn回波方法提高了约2倍。
Here we report the increase of the coherence time T(2) of a single-electron spin at room temperature by using dynamical decoupling. We show that the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence can prolong the T(2) of a single nitrogen-vacancy center in diamond up to 2.44 ms compared to the Hahn echo measurement where T(2) = 400 mu s. Moreover, by performing spin-locking experiments we demonstrate that with CPMG the maximum possible T(2) is reached. On the other hand, we do not observe a strong increase of the coherence time in nanodiamonds, possibly due to the short spin-lattice relaxation time T(1) = 100 mu s (compared to T(1) = 5.93 ms in bulk). An application for detecting low magnetic fields is demonstrated, where we show that the sensitivity using the CPMG method is improved by about a factor of 2 compared to the Hahn echo method.