利用微波作为驱动和合成反铁磁体作为耗散体实现驱动耗散型氮空位中心的长程和稳态纠缠
Long-range and steady-state entanglement of driven-dissipative nitrogen vacancy centers using microwaves as a drive and synthetic antiferromagnet as a dissipator
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中文总结 AI 辅助
研究如何实现金刚石中两个远距离氮空位中心的长程和稳态纠缠，通过微观推导Lindblad量子主方程，以微波为驱动、合成反铁磁体为耗散体，利用实际参数估计出两中心稳态并发度约为0.28。
中文摘要 AI 辅助
寻找用于介导金刚石中两个远距离氮空位中心（NVC）之间长程纠缠的最优方案和耗散环境是当前的研究热点，因其在量子传感和量子计算中有潜在应用。然而，将NVC的纠缠稳定到稳态面临重大挑战，通常需将环境调至非平衡态。本文微观推导了两个驱动耗散型NVC系统的Lindblad量子主方程，驱动为微波辐射，耗散由处于平衡态的单个磁浴提供。该方程可预测NVC长程和稳态纠缠的精确条件，还表明合成反铁磁体是耗散环境的最优选择。利用现有实验的实际参数，估计相距约100nm的两个NVC的稳态并发度可达\(\mathcal{C}\simeq 0.28\)。
英文摘要
The search for optimal schemes and dissipative environments for mediating long-range entanglement between two distant nitrogen-vacancy centers (NVCs) in diamond is the subject of ongoing vigorous efforts due to potential applications of such microscopic solid-state qubits in quantum sensing and quantum computing. However, stabilizing entanglement of NVCs into steady-state poses a significant challenge, typically requiring tuning the environment into a {\em nonequilibrium} state. Here we microscopically derive a Lindblad quantum master equation for a system of two driven-dissipative NVCs, where the drive is microwave radiation and dissipation is provided by a single magnetic bath that is kept in {\em equilibrium}. This equation allows us to predict precise conditions for long-range and steady-state entanglement of NVCs, while it also suggests synthetic antiferromagnet as an optimal choice for a dissipative environment. By using realistic parameters from available experiments, we estimate steady-state concurrence reaching $\mathcal{C}\simeq 0.28$ for two NVCs separated by $\sim 100 \: \mathrm{nm}$.
