Environment-assisted Quantum-enhanced Sensing with Electronic Spins in Diamond
Environment-assisted Quantum-enhanced Sensing with Electronic Spins in Diamond
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DOI：
10.1103/physrevapplied.12.044047
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发表时间：
2019-10-21
影响因子：
4.6
通讯作者：
Cappellaro, Paola
中科院分区：
文献类型：
--
作者：
Cooper, Alexandre;Sun, Won Kyu Calvin;Cappellaro, Paola
基于电子自旋缺陷的固态量子传感器的性能通常受到环境自旋杂质的限制，这些杂质会导致退相干。一个有前途的方法来改善这些量子传感器是将环境自旋转换为有用的资源，用于感测，特别是纠缠态。然而，从纠缠态可以实现的灵敏度增强受到实验约束的限制，例如控制误差、退相干和时间开销。在这里，我们实验证明了一个未知的电子自旋缺陷在金刚石中的氮空位中心附近的有效利用，以实现纠缠量子传感器和量子存储器的读出。我们表明，而单独的纠缠不提供灵敏度的增强，结合纠缠和重复读出实现了使用单自旋传感器的性能增强，更广泛地说，我们讨论的制度，灵敏度可以提高。我们的研究结果严格强调了使用电子自旋纠缠态改进量子传感器的挑战，同时为纠缠辅助计量提供了一个重要的基准。
The performance of solid-state quantum sensors based on electronic spin defects is often limited by the presence of environmental spin impurities that cause decoherence. A promising approach to improve these quantum sensors is to convert environment spins into useful resources for sensing, in particular, entangled states. However, the sensitivity enhancement that can be achieved from entangled states is limited by experimental constraints, such as control errors, decoherence, and time overheads. Here we experimentally demonstrate the efficient use of an unknown electronic spin defect in the proximity of a nitrogen-vacancy center in diamond to achieve both an entangled quantum sensor and a quantum memory for readout. We show that, whereas entanglement alone does not provide an enhancement in sensitivity, combining both entanglement and repetitive readout achieves an enhancement in performance over the use of a single-spin sensor, and more broadly we discuss regimes where sensitivity could be enhanced. Our results critically highlight the challenges in improving quantum sensors using entangled states of electronic spins, while providing an important benchmark in the quest for entanglement-assisted metrology.