Non-Markovianity during quantum Zeno effect

Abstract

We examine the Zeno and anti-Zeno effects in the context of non-Markovian dynamics in entangled spin-boson systems in contact with noninteracting reservoirs. We identify enhanced non-Markovian signatures in specific two-qubit partitions of a Bell-like initial state, with results showing that the intra-qubit Zeno effect or anti-Zeno effect occurs in conjunction with inter-qubit non-Markovian dynamics for a range of system parameters. The time domain of effective Zeno or anti-Zeno dynamics is about the same order of magnitude as the non-Markovian time scale of the reservoir correlation dynamics, and changes in decay rate due to the Zeno mechanism appears coordinated with information flow between specific two-qubit partitions. We extend our analysis to examine the Zeno mechanism-non-Markovianity link using the tripartite states arising from a donor-acceptor-sink model of photosynthetic biosystems.

14 pages, 4 figs., Journal of Chemical Physics (2013), to appear

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• Exciton propagation via quantum walks based on non-Hermitian coin flip operations
• The quantum Zeno and anti-Zeno effects with strong system-environment coupling
• Impact of independent reservoirs on the quantum Zeno and anti-Zeno effects
• The quantum Zeno and anti-Zeno effects with non-selective measurements