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arXiv 1805.04083quant-phmath-phmath.MP
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绝热演化的量子速度极限,Loschirm回波及以后

Quantum speed limits for adiabatic evolution, Loschmidt echo and beyond

N. Il`in, O. Lychkovskiy

摘要:

人们经常需要估计量子系统的演化状态离开希尔伯特空间的某个目标状态或目标子空间的速度。这种估计被称为量子速度极限。我们推导了一般含时目标子空间的量子速度极限。当目标子空间是含时哈密顿量的瞬时不变子空间时,所得到的量子速度极限限制了绝热保真度,这是量子绝热性的品质因数。我们还比较了两个不同的哈密顿量下的两个国家的发展,并推导出一个绑定的Loschirton回声。

英文摘要:

One often needs to estimate how fast an evolving state of a quantum system can depart from some target state or target subspace of a Hilbert space. Such estimates are known as quantum speed limits. We derive a quantum speed limit for a general time-dependent target subspace. When the target subspace is an instantaneous invariant subspace of a time-dependent Hamiltonian, the obtained quantum speed limit bounds the adiabatic fidelity, which is a figure of merit of quantum adiabaticity. We also compare two states evolving under two different Hamiltonians and derive a bound on the Loschmidt echo.

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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