相位与相位扩散的量子增强联合估计
Quantum-enhanced joint estimation of phase and phase diffusion
AI总结：
针对有噪量子计量中未知相位扩散噪声下的相位估计难题，研究利用广义Holland-Burnett态开展相位与相位扩散联合估计，发现特定平衡分束器制备态灵敏度最高且中等光子损耗下仍保持良好性能。
摘要：
在存在未知相位扩散噪声的情况下实现高精度相位估计，是有噪量子计量学中一项至关重要却颇具挑战的任务。由于相关噪声会产生严重的不利影响，这一问题尤为值得关注。本文中，我们利用以实验可实现性著称的广义Holland-Burnett态，研究相位与相位扩散的联合估计问题。即便存在光子损耗，这类量子态在单参数相位估计中的性能也能接近最优态的表现。我们采用双重研究方法：一方面通过双零差测量分析联合信息提取过程，另一方面探究所有探测态可提供的联合信息总量。通过分析我们发现，将全部输入光子导入平衡分束器的一个端口所制备的量子态，可实现最高的灵敏度。此外我们推断，即便存在中等程度的光子损耗，系统仍能保持良好的灵敏度水平，这表明我们的探测态在损耗条件下具备出色的鲁棒性。
英文摘要：
Accurate phase estimation in the presence of unknown phase diffusive noise is a crucial yet challenging task in noisy quantum metrology. This problem is particularly interesting due to the detrimental impact of the associated noise. Here, we investigate the joint estimation of phase and phase diffusion using generalized Holland-Burnett states, known for their experimental accessibility. These states provide performance close to the optimal state in single-parameter phase estimation, even in the presence of photon losses. We adopt a twofold approach by analyzing the joint information extraction through the double homodyne measurement and the joint information availability across all probe states. Through our analysis, we find that the highest sensitivities are obtained by using states created by directing all input photons into one port of a balanced beam splitter. Furthermore, we infer that good levels of sensitivity persist even in the presence of moderate photon losses, illustrating the remarkable resilience of our probe states under lossy conditions.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
