Dephasing of coupled spin qubit system during gate operations due to background charge fluctuations

Details Dephasing of coupled spin qubit system during gate operations due to background charge fluctuations Dephasing of coupled spin qubit system during gate operations due to background charge fluctuations

2004-10-04

arxiv.org/abs/cond-mat/0410060v1

Physics

Condensed Matter

Materials Science

10 pages, 7 figure. to be published

Scientific paper

10.1143/JPSJ.73.3266

It has been proposed that a quantum computer can be constructed based on electron spins in quantum dots or based on a superconducting nanocircuit. During two-qubit operations, the fluctuation of the coupling parameters is a critical factor. One source of such fluctuation is the stirring of the background charges. We focused on the influence of this fluctuation on a coupled spin qubit system. The induced fluctuation in exchange coupling changes the amount of entanglement, fidelity, and purity. In our previous study, the background charge fluctuations were found to be an important channel of dephasing for a single Josephson qubit.

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