Competition between memory-keeping and memory-erasing decoherence channels

Abstract

We study the competing effects of simultaneous Markovian and non-Markovian decoherence mechanisms acting on a single spin. We show the existence of a threshold in the relative strength of such mechanisms above which the spin dynamics becomes fully Markovian, as revealed by the use of several non-Markovianity measures. We identify a measure-dependent nested structure of such thresholds, hinting at a causality relationship amongst the various non-Markovianity witnesses used in our analysis. Our considerations are then used to argue the unavoidably non-Markovian evolution of a single-electron quantum dot exposed to both intrinsic and Markovian technical noise, the latter of arbitrary strength.

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Cited by in corpus (16)

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• Non-Markovianity degree for random unitary evolution
• Harnessing non-Markovian quantum memory by environmental coupling
• The role of information back-flow in the emergence of quantum Darwinism
• Vibration-induced coherence enhancement of the performance of a biological quantum heat engine
• Quantum non-Markovianity induced by Anderson localization
• Thermodynamic description of non-Markovian information flux of nonequilibrium open quantum systems
• Hierarchy of Non-Markovianity and $k$-divisibility phase diagram of Quantum Processes in Open Systems
• Bose-Hubbard lattice as a controllable environment for open quantum systems
• Quantifying non-Markovianity via conditional mutual information
• Multiple single-photon generations in three-level atoms coupled to cavity with non-Markovian effects
• Impurity dephasing in a Bose-Hubbard model
• Memory effects in high-dimensional systems faithfully identified by Hilbert-Schmidt speed-based witness
• Collective dynamics and entanglement of two atoms embedded into negative index material
• Information Erasure
• Critical points in two-channel quantum systems