No Cover Image

Journal article 487 views 49 downloads

Design of Feedback Control Laws for Information Transfer in Spintronics Networks / Sophie Shermer; Edmond A. Jonckheere; Frank C. Langbein

IEEE Transactions on Automatic Control, Volume: 63, Issue: 8, Pages: 2523 - 2536

Swansea University Author: Sophie, Shermer

Abstract

Information encoded in networks of stationary, interacting spin-1/2 particles is central for many applications ranging from quantum spintronics to quantum information processing. Without control, however, information transfer through such networks is generally inefficient. \new{Currently available c...

Full description

Published in: IEEE Transactions on Automatic Control
ISSN: 0018-9286 2334-3303
Published: Institute of Electrical and Electronics Engineers (IEEE) 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa37100
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Information encoded in networks of stationary, interacting spin-1/2 particles is central for many applications ranging from quantum spintronics to quantum information processing. Without control, however, information transfer through such networks is generally inefficient. \new{Currently available control methods to maximize the transfer fidelities and speeds mainly rely on dynamic control using time-varying fields and often assume instantaneous readout. We present an alternative approach to achieving} efficient, high-fidelity transfer of excitations by shaping the energy landscape via the design of time-invariant feedback control laws without recourse to dynamic control. \new{Both instantaneous readout and the more realistic case of finite readout windows are considered. The technique can also be used to freeze information by designing energy landscapes that achieve Anderson localization.} Perfect state or super-optimal transfer and localization are enabled by conditions on the eigenstructure of the system and signature properties for the eigenvectors. Given the eigenstructure enabled by super-optimality, it is shown that feedback controllers that achieve perfect state transfer are, surprisingly, also the most robust with regard to uncertainties in the system and control parameters.
Keywords: quantum systems, model-based feedback control, spin systems
College: College of Science
Issue: 8
Start Page: 2523
End Page: 2536