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arXiv 1801.01375quant-phcond-mat.mtrl-sci
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强耦合环境下固态自旋的保护

Protecting solid-state spins from strongly coupled environment

Mo Chen, Won Kyu Calvin Sun, Kasturi Saha, Jean-Christophe Jaskula, Paola Cappellaro

摘要:

量子存储器对于固态量子计算设备是至关重要的,并且好的量子存储器需要长的存储时间和快速的读/写操作。一个有前途的系统是金刚石中的氮空位(NV)中心,其中NV电子自旋作为计算量子比特,附近的核自旋作为存储量子比特。以前的作品使用远程,弱耦合的$^{13}$ C核自旋,交易读/写速度长的存储时间。在这里,我们集中在内在的强耦合$^{14}$ N核自旋。我们首先定量地了解它的退相干机制,确定其来源的电子自旋,作为一个量子涨落。然后,我们提出了一个计划,以保护量子存储器的波动噪声通过应用动态解耦的环境本身。我们证明了一个因素的$3$增强的存储时间的原理证明实验中,显示出潜在的量子存储器,结合快速操作与长的相干时间。

英文摘要:

Quantum memories are critical for solid-state quantum computing devices and a good quantum memory requires both long storage time and fast read/write operations. A promising system is the Nitrogen-Vacancy (NV) center in diamond, where the NV electronic spin serves as the computing qubit and a nearby nuclear spin as the memory qubit. Previous works used remote, weakly coupled $^{13}$C nuclear spins, trading read/write speed for long storage time. Here we focus instead on the intrinsic strongly coupled $^{14}$N nuclear spin. We first quantitatively understand its decoherence mechanism, identifying as its source the electronic spin that acts as a quantum fluctuator. We then propose a scheme to protect the quantum memory from the fluctuating noise by applying dynamical decoupling on the environment itself. We demonstrate a factor of $3$ enhancement of the storage time in a proof-of-principle experiment, showing the potential for a quantum memory that combines fast operation with long coherence time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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