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Quantum Markovian semigroups on quantum spin systems: Glauber dynamics

机译:量子自旋系统上的量子马尔可夫半群:Glauber动力学

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We study a class of KMS-symmetric quantum Markovian semigroups on a quantum spin system $(mathcal A,au,omega)$, where $mathcal A$ is a quasi-local algebra, $au$ is a strongly continuous one parameter group of $*$-automorphisms of $mathcal A$ and $omega$ is a Gibbs state on $mathcal A$. The semigroups can be considered as the extension of semigroups on the nontrivial abelian subalgebra. Let $mathcal H$ be a Hilbert space corresponding to the GNS representation constructed from $omega$. Using the general construction method of Dirichlet form developed in [8], we construct the symmetric Markovian semigroup ${T_t}_{tge0}$ on $mathcal H$. The semigroup ${T_t}_{tge0}$ acts separately on two subspaces $mathcal H_d$ and $mathcal H_{od}$ of $mathcal H$, where $mathcal H_d$ is the diagonal subspace and $mathcal H_{od}$ is the off-diagonal subspace, $mathcal H=mathcal H_doplusmathcal H_{od}$. The restriction of the semigroup ${T_t}_{tge0}$ on $mathcal H_d$ is Glauber dynamics, and for any $etainmathcal H_{od}$, $T_teta$ decays to zero exponentially fast as $t$ approaches to the infinity.
机译:我们研究了量子自旋系统$( mathcal A, tau, omega)$上的一类KMS对称量子Markovian半群,其中$ mathcal A $是准局部代数,$ tau $是一个强局部代数$ 数学A $和$ omega $的$ * $自同构的连续一个参数组是$ mathcal A $的Gibbs状态。半群可以看作是非平凡的阿贝尔次代数上半群的扩展。令$ mathcal H $为对应于由$ omega $构造的GNS表示形式的希尔伯特空间。使用在[8]中开发的Dirichlet形式的一般构造方法,我们在$ mathcal H $上构造对称的马尔可夫半群$ {T_t } _ {t ge0} $。半群$ {T_t } _ {t ge0} $分别作用于$ mathcal H $的两个子空间$ mathcal H_d $和$ mathcal H_ {od} $,其中$ mathcal H_d $是对角线子空间和$ mathcal H_ {od} $是非对角子空间,$ mathcal H = mathcal H_d oplus mathcal H_ {od} $。半群$ {T_t } _ {t ge0} $对$ mathcal H_d $的限制是Glauber动力学,对于任何$ eta in mathcal H_ {od} $,$ T_t eta $会衰减当$ t $逼近无穷大时,指数快速地变为零。

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