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Sci Rep. 2015 Nov 13;5:16357. doi: 10.1038/srep16357.

Minimal evolution time and quantum speed limit of non-Markovian open systems.

Meng X1,2,3,4, Wu C1,2,3, Guo H1,2,3.

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State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing, 100871, China.
School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China.
Center for Quantum Information Technology, Peking University, Beijing, 100871, China.
Department of Physics, Boston University, Boston, Massachusetts 02215, USA.


We derive a sharp bound as the quantum speed limit (QSL) for the minimal evolution time of quantum open systems in the non-Markovian strong-coupling regime with initial mixed states by considering the effects of both renormalized Hamiltonian and dissipator. For a non-Markovian quantum open system, the possible evolution time between two arbitrary states is not unique, among the set of which we find that the minimal one and its QSL can decrease more steeply by adjusting the coupling strength of the dissipator, which thus provides potential improvements of efficiency in many quantum physics and quantum information areas.

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