Random Matrix Ensembles For Many-Body Quantum Systems

Abstract

Classical random matrix ensembles were originally introduced in physics to approximate quantum many-particle nuclear interactions. However, there exists a plethora of quantum systems whose dynamics is explained in terms of few-particle (predominantly two-particle) interactions. The random matrix models incorporating the few-particle nature of interactions are known as embedded random matrix ensembles. In the present paper, we provide a brief overview of these two ensembles and illustrate how the embedded ensembles can be successfully used to study decoherence of a qubit interacting with an environment, both for fermionic and bosonic embedded ensembles. Numerical calculations show the dependence of decoherence on the nature of the environment.

21 pages, 5 figures, AIP Conf. Proc. for Latin American School of Physics: ELAF 2017

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• Robustness of optimal transport in disordered interacting many-body networks
• Modelling equilibration of local many-body quantum systems by random graph ensembles
• Distribution of lowest eigenvalue in $k$-body bosonic random matrix ensembles