Beating the standard quantum limit with four-entangled photons
Beating the standard quantum limit with four-entangled photons
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DOI：
10.1126/science.1138007
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发表时间：
2007-05-04
期刊：
影响因子：
56.9
通讯作者：
Takeuchi, Shigeki
中科院分区：
文献类型：
--
作者：
Nagata, Tomohisa;Okamoto, Ryo;Takeuchi, Shigeki
精确测量在所有科学领域都很重要。特别是，光相位测量可以用来测量距离、位置、位移、加速度和光路长度。量子纠缠可以实现比其他方法更高的精度。我们演示了一种光学相位测量，其中纠缠的四光子干涉可见性大于超过标准量子极限的阈值-没有纠缠可以达到的极限。这些结果为新的高精度测量应用开辟了道路。
Precision measurements are important across all fields of science. In particular, optical phase measurements can be used to measure distance, position, displacement, acceleration, and optical path length. Quantum entanglement enables higher precision than would otherwise be possible. We demonstrated an optical phase measurement with an entangled four-photon interference visibility greater than the threshold to beat the standard quantum limit-the limit attainable without entanglement. These results open the way for new high-precision measurement applications.