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It has been proposed that a quantum computer can be constructed based onelectron spins in quantum dots or based on a superconducting nanocircuit.During two-qubit operations, the fluctuation of the coupling parameters is acritical factor. One source of such fluctuation is the stirring of thebackground charges. We focused on the influence of this fluctuation on acoupled spin qubit system. The induced fluctuation in exchange coupling changesthe amount of entanglement, fidelity, and purity. In our previous study, thebackground charge fluctuations were found to be an important channel ofdephasing for a single Josephson qubit.Comment: 10 pages, 7 figure. to be publishe

Dephasing of Coupled Spin Qubit System during Gate Operations Due to Background Charge Fluctuations