论文标题
Fisher关于选择后的信息分析涉及使用光学相干状态的量子精度测量
Fisher information analysis on post-selection involved quantum precision measurements using optical coherent states
论文作者
论文摘要
在量子精度测量领域中，已经广泛考虑并进行了争论，这主要是由于成功后选择后的渔民信息降低，因此在量子精度测量领域进行了广泛的考虑和辩论。在这项工作中，我们表明，使用光学连贯状态作为仪表，而不是通常考虑的高斯仪表状态，WVA测量肯定可以优于常规测量，而不涉及术后选择策略。 %%我们还表明，与WVA方案相比，相干状态的混合物比具有相同平均光子数量相同的纯连贯状态更好。这与在没有选择后证明的主张形成鲜明对比。选择后策略还可以导致海森堡（甚至是“超级生命”）的精确度，但没有使用任何昂贵的量子资源。 %%当前的工作可能会刺激进一步的研究，以在量子精确度测量中进行选择后策略的潜力。
The weak-value-amplification (WVA) technique has been extensively considered and debated in the field of quantum precision measurement, largely owing to the reduced Fisher information caused by the low probability of successful post-selection. %% In this work we show that, rather than the Gaussian meter state as typically considered, using the optical coherent state as a meter, the WVA measurement can definitely outperform the conventional measurement not involving the strategy of post-selection. %% We also show that the post-selection procedure involved in the WVA scheme can make a mixture of coherent states work better than a pure coherent state with identical average photon numbers. This is in sharp contrast to the claim proved in the absence of post-selection. The post-selection strategy can also result in the precision of Heisenberg (or even "super-Heisenberg") scaling with the photon numbers, but without using any expensive quantum resources. %% The present work may stimulate further investigations for the potential of the post-selection strategy in quantum precision measurements.
