论文标题
出现的问题：基于时间逆转的量子计量学具有多体纠缠状态
Matters Arising: Time-reversal-based quantum metrology with many-body entangled states
论文作者
论文摘要
在论文中，“基于时间逆转的量子计量学具有多体纠缠状态”（2022年），科伦坡等。 al。主张以一种无法使用独立粒子来实现的精确度的未知相和振荡磁场的主张 - 一种被称为标准量子极限的极限。通过纠缠$ \ sim300 $ Atoms的合奏，Colombo，ET。 al。测量远离已知初始状态的旋转角度，并在290 Hz处测量磁场振荡。作者报告的实验精度约为4倍，超出相同数量的独立原子（分别为12.8 dB和11.8 dB）的实验精度。这些主张是不正确的。 Colombo等。 al。请勿超过300个独立粒子的精度，甚至超过了单个粒子的精度。 Colombo等。 al。引用了几个使用纠缠超过标准量子极限的实验。每篇引用的论文都会对我们在此处突出的类型进行不正确，不完整或误导性比较。结果是，单个粒子精度结合从未在纠缠中超越实验。
In their paper "Time-reversal-based quantum metrology with many-body entangled states" Nature Physics (2022), Colombo et. al. claim to measure both an unknown phase and an oscillating magnetic field with a precision that cannot be achieved using independent particles - a limit known as the standard quantum limit. By entangling an ensemble of $\sim300$ atoms, Colombo et. al. measure an angle of rotation away from a known initial state and additionally measure a magnetic field oscillating at 290 Hz. The authors report an experimental precision approximately a factor of 4 beyond what is possible with the same number of independent atoms (12.8 dB and 11.8 dB for these tasks respectively). These claims are incorrect. Colombo et. al. do not surpass the precision bound for 300 independent particles, nor do they even surpass the precision bound for a single particle. Colombo et. al. cite several experiments that surpass the standard quantum limit using entanglement. Each and every paper cited performs incorrect, incomplete or misleading comparisons of the type that we highlight here. The consequence being that the single particle precision bound has never been experimentally surpassed with entanglement.
