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Open Quantum Systems Decoherence

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

arXiv
Authors: Juho Lankinen, Henri Lyyra, Boris Sokolov, Jose Teittinen, Babak Ziaei, Sabrina Maniscalco

Year

2015

Paper ID

25999

Status

Preprint

Abstract Read

~2 min

Abstract Words

87

Citations

N/A

Abstract

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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  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
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  • We present a general model of qubit dynamics which entails pure dephasing and dissipative time-local master equations.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1511.07202 [2] arXiv https://arxiv.org/abs/1511.07202 [3] Publisher https://arxiv.org/abs/1511.07202

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