Robust Decoupling Techniques to Extend Quantum Coherence in Diamond
Robust Decoupling Techniques to Extend Quantum Coherence in Diamond
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DOI：
10.1103/physrevlett.105.200402
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发表时间：
2010-11-12
影响因子：
8.6
通讯作者：
Cory, D. G.
中科院分区：
文献类型：
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作者：
Ryan, C. A.;Hodges, J. S.;Cory, D. G.
我们实验证明，通过实施去耦合技术，金刚石中氮空位中心的室温相干时间增加了两个数量级以上。我们证明了等脉冲间隔去耦合的性能与非周期Uhrig去耦合一样好，并且还允许我们利用回波中的复苏来探索最长的相干时间。在很短的时间内，我们可以将特定量子态的相干性从T*(2)=2.7u S扩展到有效的T~2&gT；340u S。为了保持任意态，我们证明了使用脉冲序列通过明智地选择脉冲的相位来补偿所有输入态的单个脉冲的缺陷的实验重要性。我们使用这些补偿序列来增强回波恢复，并在超纯天然丰度C-13钻石上显示了超过1.6ms的相干时间。
We experimentally demonstrate over 2 orders of magnitude increase in the room-temperature coherence time of nitrogen-vacancy centers in diamond by implementing decoupling techniques. We show that equal pulse spacing decoupling performs just as well as nonperiodic Uhrig decoupling and also allows us to take advantage of revivals in the echo to explore the longest coherence times. At short times, we can extend the coherence of particular quantum states out from T*(2) = 2.7 mu s out to an effective T-2 > 340 mu s. For preserving arbitrary states we show the experimental importance of using pulse sequences that compensate the imperfections of individual pulses for all input states through judicious choice of the phase of the pulses. We use these compensated sequences to enhance the echo revivals and show a coherence time of over 1.6 ms in ultrapure natural abundance C-13 diamond.