论文标题
通过混乱的量子计量
Quantum metrology via chaos in a driven Bose-Josephson system
论文作者
论文摘要
纠缠准备和信号积累对于量子参数估计至关重要，这对理论和实验都构成了重大挑战。在这里，我们建议如何在定期驱动的玻色 - 约瑟夫森系统中利用混沌动力学，以实现超过标准量子极限（SQL）的高精度测量。从初始的非输入状态开始，混沌动力学会产生量子纠缠，并同时编码要估计的参数。通过使用合适的混沌动力学，估计参数的最终测量精度可以击败SQL。也可以通过特定的可观察结果（例如种群测量值）获得子-SQL测量精度缩放，可以通过最先进的技术实现。我们的研究不仅提供了理解量子混乱和量子古典通信的新见解，而且还提供了有希望的应用在纠缠增强的量子计量学中的应用。
Entanglement preparation and signal accumulation are essential for quantum parameter estimation, which pose significant challenges to both theories and experiments. Here, we propose how to utilize chaotic dynamics in a periodically driven Bose-Josephson system for achieving a high-precision measurement beyond the standard quantum limit (SQL). Starting from an initial non-entangled state, the chaotic dynamics generates quantum entanglement and simultaneously encodes the parameter to be estimated. By using suitable chaotic dynamics, the ultimate measurement precision of the estimated parameter can beat the SQL. The sub-SQL measurement precision scaling can also be obtained via specific observables, such as population measurements, which can be realized with state-of-art techniques. Our study not only provides new insights for understanding quantum chaos and quantum-classical correspondence, but also is of promising applications in entanglement-enhanced quantum metrology.
