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Gating classical information flow via equilibrium quantum phase transitions

Banchi, L; Fernandez-Rossier, J; Hirjibehedin, CF; Bose, S; (2017) Gating classical information flow via equilibrium quantum phase transitions. Physical Review Letters , 118 (14) , Article 147203. 10.1103/PhysRevLett.118.147203. Green open access

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Abstract

The development of communication channels at the ultimate size limit of atomic scale physical dimensions will make the use of quantum entities an imperative. In this regime, quantum fluctuations naturally become prominent and are generally considered to be detrimental. Here, we show that for spin-based information processing, these fluctuations can be uniquely exploited to gate the flow of classical binary information across a magnetic chain in thermal equilibrium. Moreover, this information flow can be controlled with a modest external magnetic field that drives the system through different many-body quantum phases in which the orientation of the final spin does or does not reflect the orientation of the initial input. Our results are general for a wide class of anisotropic spin chains that act as magnetic cellular automata and suggest that quantum phase transitions play a unique role in driving classical information flow at the atomic scale.

Type: Article
Title: Gating classical information flow via equilibrium quantum phase transitions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.118.147203
Publisher version: https://doi.org/10.1103/PhysRevLett.118.147203
Language: English
Additional information: Copyright © 2017 American Physical Society.
Keywords: Mesoscale and Nanoscale Physics; Statistical Mechanics; Strongly Correlated Electrons; Quantum Physics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1502559
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