DocumentCode :
3744074
Title :
Time optimal information transfer in spintronics networks
Author :
Frank C Langbein;Sophie Schirmer;Edmond Jonckheere
Author_Institution :
School of Computer Science &
fYear :
2015
Firstpage :
6454
Lastpage :
6459
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 :
"Optimization","Couplings","Eigenvalues and eigenfunctions","Electric potential","Magnetoelectronics","Routing","Control systems"
Publisher :
ieee
Conference_Titel :
Decision and Control (CDC), 2015 IEEE 54th Annual Conference on
Type :
conf
DOI :
10.1109/CDC.2015.7403236
Filename :
7403236
Link To Document :
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