标题： 通过光子到达时间分析直接读取金刚石中氮空位杂交自旋量子寄存器 显示英文标题

标题： Direct Readout of Nitrogen-Vacancy Hybrid-Spin Quantum Register in Diamond by Photon Arrival Time Analysis

摘要： 量子态读出在量子技术中起着关键作用，应用于传感、计算和安全通信等领域。 在本工作中，我们介绍了一种新方法，利用单个激光脉冲高效地读取金刚石氮空位中心的混合自旋态的种群，该方法利用了约500Gs处的激发态能级反交叉机制。 通过这种方法读取自旋态种群可以达到与传统量子态对角线层析成像相同的效果，同时将实验时间减少了数量级，并保持保真度。 此外，这种方法可能扩展到完整的态层析成像，从而省去了自旋操控序列的要求，并减轻了整个过程中由退相干引起的误差。 显示英文摘要

摘要： Quantum state readout plays a pivotal role in quantum technologies, spanning applications in sensing, computation, and secure communication. In this work, we introduce a new approach for efficiently reading populations of hybrid-spin states in the nitrogen-vacancy center of diamond using a single laser pulse, which utilizes the excited state level anti-crossing mechanism at around 500 Gs. Reading spin state populations through this approach achieves the same outcome as traditional quantum state diagonal tomography but significantly reduces the experimental time by an order of magnitude while maintaining fidelity. Moreover, this approach may be extended to encompass full-state tomography, thereby obviating the requirement for a sequence of spin manipulations and mitigating errors induced by decoherence throughout the procedure.