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:
影响因子:
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通讯作者:
F. Fagnola
中科院分区:
文献类型:
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作者:
R. Carbone;F. Fagnola
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.