On the Floquet analysis of commutative periodic Lindbladians in finite dimension

Abstract

We consider the Markovian Master Equation over matrix algebra ${\mathbb{M}}_d$, governed by periodic Lindbladian $L_t$ in standard (Kossakowski-Lindblad-Gorini-Sudarshan) form. It is shown that under simplifying assumption of commutativity, i.e. if $L_t{L}_{t^{\prime }}=L_{t^{\prime }}{L}_t$ for any moments of time $t,t^{\prime }\in {\mathbb{R}}_{+}$, the Floquet normal form of resulting completely positive dynamical map is not guaranteed to be given by simultaneously globally Markovian maps. In fact, the periodic part of the solution is even shown to be necessarily non-Markovian. Two examples in algebra ${\mathbb{M}}_2$ are explicitly calculated: a periodically modulated random qubit dynamics, being a generalization of pure decoherence scheme, and a classically perturbed two-level system, coupled to reservoir via standard ladder operators.

arXiv comment20 pages, 2 figures; final version

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• On the Lyapunov-Perron reducible Markovian Master Equation
• Markovian dynamics under weak periodic coupling