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Testing the validity of the ‘local’ and ‘global’ GKLS master equations on an exactly solvable model

González, J. Onam; Correa, Luis A.; Nocerino, Giorgio; Palao, José P.; Alonso, Daniel; Adesso, Gerardo

Authors

J. Onam González jgonzall@ull.es

Luis A. Correa Luis.Correa@nottingham.ac.uk

Giorgio Nocerino pmxgn@nottingham.ac.uk

José P. Palao

Daniel Alonso



Abstract

When deriving a master equation for a multipartite weakly-interacting open quantum systems, dissipation is often addressed locally on each component, i.e. ignoring the coherent couplings, which are later added ‘by hand’. Although simple, the resulting local master equation (LME) is known to be thermodynamically inconsistent. Otherwise, one may always obtain a consistent global master equation (GME) by working on the energy basis of the full interacting Hamiltonian. Here, we consider a two-node ‘quantum wire’connected to two heat baths. The stationary solution of the LME and GME are obtained and benchmarked against the exact result. Importantly, in our model, the validity of the GME is constrained by the underlying secular approximation. Whenever this breaks down (for resonant weakly-coupled nodes), we observe that the LME, in spite of being thermodynamically flawed: (a) predicts the correct steady state, (b) yields with the exact asymptotic heat currents, and (c) reliably reflects the correlations between the nodes. In contrast, the GME fails at all three tasks. Nonetheless, as the inter-node coupling grows, the LME breaks down whilst the GME becomes correct. Hence, the global and local approach may be viewed as complementary tools, best suited to different parameter regimes.

Journal Article Type Article
Publication Date Nov 30, 2017
Journal Open Systems & Information Dynamics
Electronic ISSN 1230-1612
Publisher World Scientific
Peer Reviewed Peer Reviewed
Volume 24
Issue 4
Article Number e1740010
APA6 Citation González, J. O., Correa, L. A., Nocerino, G., Palao, J. P., Alonso, D., & Adesso, G. (2017). Testing the validity of the ‘local’ and ‘global’ GKLS master equations on an exactly solvable model. Open Systems and Information Dynamics, 24(4), https://doi.org/10.1142/S1230161217400108
DOI https://doi.org/10.1142/S1230161217400108
Publisher URL http://www.worldscientific.com/doi/abs/10.1142/S1230161217400108
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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