论文标题
通过使用相干测量值的实验证明相位估计优势在存在去极化噪声的情况下
Experimental demonstration of phase estimation advantage in presence of depolarizing noise by using coherent measurements
论文作者
论文摘要
我们报告了混合探针状态时测量在量子计量学中的作用的实验研究。特别是，我们调查了在嘈杂的极化状态纠缠的光子状态下，调查了涉及纠缠操作的优化局部测量和一般全球投射测量。我们通过实验证明，全局测量在优化的本地策略方面具有参数估计的优势。此外，即使噪声的量没有很好地表征，全球策略即使噪声量没有很好地表征有关感兴趣的参数的明确信息。这表明，量子操作的一致性，例如我们协议中使用的铃态投影装置，可用于进一步提高计量学中的量子优势，并在未来的量子测量设备设计中发挥基本作用。
We report an experimental investigation of the role of measurement in quantum metrology when the states of the probes are mixed. In particular, we investigated optimized local measurements and general global projective measurements, involving entangling operations, on noisy Werner states of polarization entangled photons. We demonstrate experimentally that global measurement presents an advantage in parameter estimation with respect to the optimized local strategy. Moreover, the global strategy provides unambiguous information about the parameter of interest even when the amount of noise is not well characterized. This shows that the coherence in quantum operations, such as the Bell-state projection device used in our protocol, can be used to further boost the quantum advantage in metrology and play a fundamental role in the design of future quantum measurement devices.
