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arXiv 2102.11215cond-mat.quant-gasphysics.atom-phquant-ph
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原子量子气体中吸引相互作用猝灭时准粒子对产生和量子纠缠的观测

Observation of quasiparticle pair-production and quantum entanglement in atomic quantum gases quenched to an attractive interaction

Cheng-An Chen, Sergei Khlebnikov, Chen-Lung Hung

摘要:

我们观察到准粒子对的产生,并描述了原子超流体中调制不稳定性产生的量子纠缠。通过将原子间的相互作用淬灭到吸引,然后再回到弱排斥,我们产生了相关准粒子,并通过测量原位密度噪声功率谱来监测它们在超流体中的演化,该功率谱基本上测量了基态原子和动量相反的准粒子之间的“零差”干涉。我们观察到大幅度增长的功率谱和随后的相干振荡在一个宽的空间频带内,我们的分辨率限制,演示相干准粒子的产生和演化。光谱被观察到振荡低于由Peres-Horodecki连续变量状态的可分性准则设置的量子极限,从而确认相互作用猝灭诱导的准粒子之间的量子纠缠。

英文摘要:

We report observation of quasiparticle pair-production and characterize quantum entanglement created by a modulational instability in an atomic superfluid. By quenching the atomic interaction to attractive and then back to weakly repulsive, we produce correlated quasiparticles and monitor their evolution in a superfluid through evaluating the in situ density noise power spectrum, which essentially measures a 'homodyne' interference between ground state atoms and quasiparticles of opposite momenta. We observe large amplitude growth in the power spectrum and subsequent coherent oscillations in a wide spatial frequency band within our resolution limit, demonstrating coherent quasiparticle generation and evolution. The spectrum is observed to oscillate below a quantum limit set by the Peres-Horodecki separability criterion of continuous-variable states, thereby confirming quantum entanglement between interaction quench-induced quasiparticles.

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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