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arXiv 2602.09327quant-ph
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通过耦合到其热运动,原子对的自旋纠缠

Spin-entanglement of an atomic pair through coupling to their thermal motion

University of Otago(奥塔哥大学);The Dodd-Walls Centre for Photonic and Quantum Technologies, University of Otago(奥塔哥大学多德-沃尔斯光子与量子技术中心);University of Auckland(奥克兰大学);Research School of Physics, The Australian National University(澳大利亚国立大学物理研究学院)

Poramaporn Ruksasakchai, Lucile Sanchez, Marvin Weyland, Mikkel F. Andersen, Scott Parkins, Stuart S. Szigeti

AI总结:

通过耦合到热运动,研究发现原子对的自旋态可从未纠缠演化为纠缠态,该纠缠在增强测量灵敏度方面具有潜在应用价值。

摘要:

两个碱土原子在光学镊子中的自旋动力学由引起自旋变化的碰撞驱动,这些碰撞将原子的自旋态与其相对运动耦合。本文实验研究了当相对运动处于热态且k_B T远大于参与动力学的自旋态能量时所形成的自旋态。我们发现,初始未纠缠的自旋态可以演化成纠缠态。这与通常情况相反,即当将量子系统耦合到热自由度时,会导致纠缠丢失而非生成。此外,我们还展示所生成的纠缠在技术上是有用的,因为它原则上可以增强测量的灵敏度,超越标准量子极限。这可能为未来技术提供一种有前景的稳健纠缠生成途径。

英文摘要:

The spin-dynamics of two alkali atoms in an optical tweezer is driven by spin-changing collisions that couple the spin-state of the atoms to their relative motion. This paper experimentally studies the resulting spin-states when the relative motion is in a thermal state with k B T much larger than the energies of the spin-states that take part in the dynamics. We find that an initially unentangled spin-state can evolve into an entangled state. This is contrary to the common case when coupling a quantum system to hot degrees of freedom leads to loss of entanglement and not its generation. Moreover, we show that the generated entanglement is technologically useful as it, in principle, can enhance the sensitivity of measurements beyond the standard quantum limit. This may provide a promising avenue for robust entanglement generation for future technologies.

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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