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RESEARCH PRODUCT

Competition between memory-keeping and memory-erasing decoherence channels

Tony J. G. ApollaroTony J. G. ApollaroMauro PaternostroMauro PaternostroFrancesco PlastinaSalvatore LorenzoCarlo Di Franco

subject

Quantum decoherenceNON-MARKOVIAN DYNAMICSMarkov processFOS: Physical sciencesRelative strengthSPINS01 natural sciencesNoise (electronics)Settore FIS/03 - Fisica Della Materia010305 fluids & plasmasCausality (physics)symbols.namesakeSYSTEMSQuantum mechanics0103 physical sciencesStatistical physicsQuantum information010306 general physicsSpin-½PhysicsQuantum Physics/dk/atira/pure/subjectarea/asjc/3100/3107Atomic and Molecular Physics and OpticsQuantum dotsymbolsSEMICONDUCTOR QUANTUM DOTSQuantum Physics (quant-ph)

description

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 among 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. 

yearjournalcountryeditionlanguage
2014-07-08
10.1103/physreva.90.012310http://arxiv.org/abs/1311.2045