DMCA
FAST TRACK COMMUNICATION Electron dynamics in quantum gate operation (2007)
BibTeX
@MISC{Kerridge07fasttrack,
author = {A Kerridge and A H Harker and A M Stoneham},
title = {FAST TRACK COMMUNICATION Electron dynamics in quantum gate operation},
year = {2007}
}
Share
 |
 |
 |
 |
||
OpenURL
Abstract
We model the evolving time-dependent electronic structure of a solid-state quantum gate as it performs basic quantum operations. Our time-dependent configuration-interaction method follows the evolution of two donor electron spin qubits interacting with a third, optically excited, control spin in an applied magnetic field, a possible realization of the basic component of a proposed quantum information processor. We identify unitary operations which approximately disentangle the control spin, and use them to construct high-accuracy two-electron operations that are locally equivalent to CNOT, SWAP and SWAP operations. From our evaluation of the accuracy of a set of candidate gates we estimate the residual entanglement of the control electron and overall gate operation times. These results attest to the feasibility of the silicon-based quantum gates proposed by Stoneham, Fisher and Greenland. Quantum phenomena offer a route to radical developments in information technology. On
Keyphrases
quantum gate operation fast track communication electron dynamic quantum phenomenon basic component silicon-based quantum gate radical development control electron high-accuracy two-electron operation swap operation overall gate operation time donor electron spin qubits basic quantum operation residual entanglement quantum information processor possible realization candidate gate information technology applied magnetic field solid-state quantum gate unitary operation time-dependent configuration-interaction method time-dependent electronic structure control spin
