Electron dynamics in quantum gate operation

Kerridge, A. and Harker, A. H. and Stoneham, A. M. (2007) Electron dynamics in quantum gate operation. Journal of Physics: Condensed Matter, 19 (28). ISSN 0953-8984

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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 root 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.

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Journal Article
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Journal of Physics: Condensed Matter
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03 Nov 2014 10:27
Last Modified:
22 Nov 2022 01:16