Landauer Current and Mutual Information

Abstract

We study quantum evolution of the entanglement of a quantum dot connected to left and right leads initially maintained at chemical potentials ${\mu }_L$ and ${\mu }_R$ respectively, within the non-interacting resonant-level model. The full nonequilirbium mixed state density matrix of the whole system is written down exactly, and entanglement is computed by recourse to the notion of mutual information. A strong and direct correlation is found between the Landauer current, and the entanglement at all times, the steady-state values in particular displaying a quadratic relationship at high temperatures. Strikingly, it is found that one can obtain a maximally entangled quantum dot by simply applying a sufficiently large `source-drain' voltage $V_{SD}$ even at high temperatures.

5 pages, 4 figures, Modified Title

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