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arXiv 1002.4190math-phcond-mat.othercond-mat.str-elhep-latmath.MPquant-ph
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依赖于相互作用强度的Lieb-Robinson界

Lieb-Robinson bounds with dependence on interaction strengths

Isabeau Prémont-Schwarz, Jeff Hnybida

摘要:

我们提出了新的Lieb-Robinson界限(量子系统中信息传播速度的界限),并明确依赖于哈密顿量的相互作用强度。对于具有两个以上相互作用的系统,发现Lieb-Robinson速度在相互作用强度中并不总是代数的。我们考虑哈密顿与任何有限数目的有界算子,也有一定的一类无界算子。我们得到了格点上的量子系统的界和传播速度,以及具有一种齐性和各向同性的一般图。这种形式主义可能有用的一个领域是当相互作用强度变化时发生的量子相变的研究。

英文摘要:

We propose new Lieb-Robinson bounds (bounds on the speed of propagation of information in quantum systems) with an explicit dependence on the interaction strengths of the Hamiltonian. For systems with more than two interactions it is found that the Lieb-Robinson speed is not always algebraic in the interaction strengths. We consider Hamiltonians with any finite number of bounded operators and also a certain class of unbounded operators. We obtain bounds and propagation speeds for quantum systems on lattices and also general graphs possessing a kind of homogeneity and isotropy. One area for which this formalism could be useful is the study of quantum phase transitions which occur when interactions strengths are varied.

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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