Exponential L-convergence of quantum Markov semigroups on B(h)

Exponential L-convergence of quantum Markov semigroups on B(h)
复制标题

B(h) 上量子马尔可夫半群的指数 L 收敛

DOI:
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发表时间:
2007
期刊:
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通讯作者:
F. Fagnola
F. Fagnola
中科院分区:
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文献类型:
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作者:
R. Carbone;F. Fagnola

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对于B(h)上的量子Markov半群(Tt)t≥0且具有忠实的正规不变态ρ,我们将h上的Hilbert-Schmidt算子半群T(s)(s ∈ [0,1])联系起来,T(s)t(ρ s/2xρ(1−s)/2)= ρTt(x)ρ.这使我们能够使用谱理论来研究T(s)的无穷小生成元L(s),并通过估计L(s)的谱间隙来推导关于收敛到T的平衡点的速度的信息。将该方法应用于B(h)上一类s = 1/2的量子马氏半群.给出了gap(L(1/2))为正的简单但相当一般的充分必要条件。间隙(L(1/2))的精确值计算或估计在某些情况下,由经典概率和物理应用的动机。
With a quantum Markov semigroup (Tt)t≥0 on B(h) with a faithful normal invariant state ρ we associate semigroups T (s) (s ∈ [0, 1]) on Hilbert-Schmidt operators on h defined by T (s) t (ρ s/2xρ(1−s)/2) = ρTt(x)ρ. This allows us to use spectral theory to study the infinitesimal generator L(s) of T (s) and deduce informations on the speed of convergence to the equilibrium of T by means of estimates of the spectral gap of L(s). This method is applied to a class of quantum Markov semigroups on B(h) with s = 1/2. Simple but reasonably general sufficient as well as necessary and sufficient conditions for gap(L(1/2)) to be positive are given. The exact value of gap(L(1/2)) is computed or estimated in some cases motivated by classical probability and physical applications.