arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.02991quant-ph
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自旋链中量子相变的操纵量子相干性

Steered quantum coherence as a signature of quantum phase transitions in spin chains

Ming-Liang Hu, Yun-Yue Gao, Heng Fan

摘要:

我们提出用受控的量子相干性(SQC)作为量子相变(QPT)的特征。通过考虑不同的自旋链模型,包括横场伊辛模型、\textit{XY}模型和考虑三自旋相互作用的\textit{XX}模型,我们发现SQC及其一阶导数成功地指示了QPT的不同临界点.特别地,SQC方法对于从链中选择的任何自旋对都是有效的,并且与纠缠和量子不和谐相反,SQC的强度对测试自旋的距离(只要它不是很短)不敏感,这使得它便于实际使用,因为不需要仔细选择链中的两个自旋。

英文摘要:

We propose to use the steered quantum coherence (SQC) as a signature of quantum phase transitions (QPTs). By considering various spin chain models, including the transverse-field Ising model, \textit{XY} model, and \textit{XX} model with three-spin interaction, we showed that the SQC and its first-order derivative succeed in signaling different critical points of QPTs. In particular, the SQC method is effective for any spin pair chosen from the chain, and the strength of SQC, in contrast to entanglement and quantum discord, is insensitive to the distance (provided it is not very short) of the tested spins, which makes it convenient for practical use as there is no need for careful choice of two spins in the chain.

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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