Purification of an unpolarized spin ensemble into entangled singlet pairs.
Purification of an unpolarized spin ensemble into entangled singlet pairs.
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DOI：
10.1038/s41598-017-00603-z
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发表时间：
2017-04-03
影响因子：
4.6
通讯作者：
Wrachtrup J
中科院分区：
文献类型：
--
作者：
Greiner JN;Dasari DBR;Wrachtrup J
核自旋系综的动力学极化对于磁共振研究、精密传感和量子信息理论的应用具有重要意义。在这里，我们提出了一个计划，以产生长寿命的单重态对的非极化核自旋系综是偶极耦合到金刚石中的氮空位中心的电子自旋。由NV中心的频繁自旋选择性读出引起的量子力学反作用允许核自旋配对成最大纠缠的单态对。反直觉地，对形成的鲁棒性去相位噪声提高与自旋系综的大小增加。我们还展示了如何配对的核自旋状态允许增强检测能力的NV中心的钻石。
Dynamical polarization of nuclear spin ensembles is of central importance for magnetic resonance studies, precision sensing and for applications in quantum information theory. Here we propose a scheme to generate long-lived singlet pairs in an unpolarized nuclear spin ensemble which is dipolar coupled to the electron spins of a Nitrogen Vacancy center in diamond. The quantum mechanical back-action induced by frequent spin-selective readout of the NV centers allows the nuclear spins to pair up into maximally entangled singlet pairs. Counterintuitively, the robustness of the pair formation to dephasing noise improves with increasing size of the spin ensemble. We also show how the paired nuclear spin state allows for enhanced sensing capabilities of NV centers in diamond.