Environment-assisted quantum transport in a 10-qubit network
Abstract
The way in which energy is transported through an interacting system governs fundamental properties in many areas of physics, chemistry, and biology. Remarkably, environmental noise can enhance the transport, an effect known as environment-assisted quantum transport (ENAQT). In this paper, we study ENAQT in a network of coupled spins subject to engineered static disorder and temporally varying dephasing noise. The interacting spin network is realized in a chain of trapped atomic ions and energy transport is represented by the transfer of electronic excitation between ions. With increasing noise strength, we observe a crossover from coherent dynamics and Anderson localization to ENAQT and finally a suppression of transport due to the quantum Zeno effect. We found that in the regime where ENAQT is most effective the transport is mainly diffusive, displaying coherences only at very short times. Further, we show that dephasing characterized by non-Markovian noise can maintain coherences longer than white noise dephasing, with a strong influence of the spectral structure on the transport effciency. Our approach represents a controlled and scalable way to investigate quantum transport in many-body networks under static disorder and dynamic noise.
Cite
@article{arxiv.1809.07680,
title = {Environment-assisted quantum transport in a 10-qubit network},
author = {Christine Maier and Tiff Brydges and Petar Jurcevic and Nils Trautmann and Cornelius Hempel and Ben P. Lanyon and Philipp Hauke and Rainer Blatt and Christian F. Roos},
journal= {arXiv preprint arXiv:1809.07680},
year = {2019}
}
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