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Complete positivity, finite temperature effects, and additivity of noise for time-local qubit dynamics

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arxiv 1511.07202 v1 pith:X4SFQ3W5 submitted 2015-11-23 quant-ph

classification quant-ph
keywords markovianadditivitybeyondcompletedephasingdynamicseffectslimit
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We present a general model of qubit dynamics which entails pure dephasing and dissipative time-local master equations. This allows us to describe the combined effect of thermalisation and dephasing beyond the usual Markovian approximation. We investigate the complete positivity conditions and introduce a heuristic model that is always physical and provides the correct Markovian limit. We study the effects of temperature on the non-Markovian behaviour of the system and show that the noise additivity property discussed by Yu and Eberly in Ref. [1] holds beyond the Markovian limit.

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  1. Open-systems tools for non-thermalizing closed quantum systems

    quant-ph 2025-04 conditional novelty 6.0 of 10

    State-dependent, excitation-conserving quantum circuits with adaptively chosen gate arrangements maintain inhomogeneous non-thermalizing qubit dynamics that open-systems tools can distinguish from random thermalizing ...

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