arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.15828quant-phcond-mat.quant-gas
收藏

幂律相互作用的Lieb-Robinson光锥

The Lieb-Robinson light cone for power-law interactions

Minh C. Tran, Andrew Y. Guo, Christopher L. Baldwin, Adam Ehrenberg, Alexey V. Gorshkov, Andrew Lucas

摘要:

Lieb-Robinson定理指出,信息在具有最近邻相互作用的晶格上的量子系统中以有限速度传播。在具有幂律相互作用的量子系统中,信息传播的速度极限是多少?在距离$r$处,信息以$1/r^α$形式衰减。在这里,我们提出了一个明确的答案,这个问题的所有指数$α>2d$和所有空间维度$d$。示意性地,信息至少花费$r^{\min\{1, α-2d\}}$的时间来传播距离~ $r$。随着最近的状态转移协议饱和这个界限,我们的工作结束了长达数十年的寻找最佳的Lieb-Robinson界限的量子信息动力学与幂律相互作用。

英文摘要:

The Lieb-Robinson theorem states that information propagates with a finite velocity in quantum systems on a lattice with nearest-neighbor interactions. What are the speed limits on information propagation in quantum systems with power-law interactions, which decay as $1/r^α$ at distance $r$? Here, we present a definitive answer to this question for all exponents $α>2d$ and all spatial dimensions $d$. Schematically, information takes time at least $r^{\min\{1, α-2d\}}$ to propagate a distance~$r$. As recent state transfer protocols saturate this bound, our work closes a decades-long hunt for optimal Lieb-Robinson bounds on quantum information dynamics with power-law interactions.

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。

↑