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arXiv 2102.07056quant-ph
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绝热量子精密测量的海森堡标度

Experimental Adiabatic Quantum Metrology with the Heisenberg scaling

Ran Liu, Yu Chen, Min Jiang, Xiaodong Yang, Ze Wu, Yuchen Li, Haidong Yuan, Xinhua Peng, Jiangfeng Du

摘要:

利用量子相变进行高精度测量的临界量子精密测量近年来受到越来越多的关注。然而,由于连续的量子相变只存在于热力学极限,因此具有连续量子相变的临界量子精密测量在实验上是非常具有挑战性的。本文提出了一个绝热方案,研究了具有一级量子相变的微扰伊辛自旋模型。利用Landau-Zener反交叉,我们不仅可以在基态对未知参量进行编码,而且可以通过调节能隙来控制绝热过程的演化时间。我们在核磁共振实验上实现了绝热方案,并表明所达到的精度达到了海森堡标度。该方案具有易于实现、抗衰减能力强、能隙可调等优点,对量子精密测量的实际应用具有重要意义。

英文摘要:

The critical quantum metrology, which exploits the quantum phase transition for high precision measurement, has gained increasing attention recently. The critical quantum metrology with the continuous quantum phase transition, however, is experimentally very challenging since the continuous quantum phase transition only exists at the thermal dynamical limit. Here, we propose an adiabatic scheme on a perturbed Ising spin model with the first order quantum phase transition. By employing the Landau-Zener anticrossing, we can not only encode the unknown parameter in the ground state but also tune the energy gap to control the evolution time of the adiabatic passage. We experimentally implement the adiabatic scheme on the nuclear magnetic resonance and show that the achieved precision attains the Heisenberg scaling. The advantages of the scheme-easy implementation, robust against the decay, tunable energy gap-are critical for practical applications of quantum metrology.

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。

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