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Time optimal information transfer in spintronics networks / Frank C Langbein; Sophie Schirmer; Edmond Jonckheere; Sophie Shermer

Pages: 6454 - 6459

Swansea University Author: Sophie, Shermer

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DOI (Published version): 10.1109/CDC.2015.7403236

Abstract

Propagation of information encoded in spin degrees of freedom through networks of coupled spins enables important applications in spintronics and quantum information processing. We study control of information propagation in networks of spin-1/2 particles with uniform nearest neighbor couplings form...

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ISBN: 978-1-4799-7884-7
Published: Osaka IEEE 2015
URI: https://cronfa.swan.ac.uk/Record/cronfa23894
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Abstract: Propagation of information encoded in spin degrees of freedom through networks of coupled spins enables important applications in spintronics and quantum information processing. We study control of information propagation in networks of spin-1/2 particles with uniform nearest neighbor couplings forming a ring with a single excitation in the network as simple prototype of a router for spin-based information. Specifically optimizing spatially distributed potentials, which remain constant during information transfer, simplifies the implementation of the routing scheme. However, the limited degrees of freedom makes finding a control that maximizes the transfer probability in a short time difficult. We show that the structure of the eigenvalues and eigenvectors must fulfill a specific condition to be able to maximize the transfer fidelity, and demonstrate that a specific choice among the many potential structures that fulfill this condition significantly improves the solutions found by optimal control.
Keywords: quantum spintronics, robust control
College: College of Science
Start Page: 6454
End Page: 6459