Dephasing of Coupled Spin Qubit System during Gate Operations Due to Background Charge Fluctuations(Cross-disciplinary Physics and Related Areas of Science and Technology)
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概要
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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 coupling parameters is a critical factor. One source of such fluctuation is the stirring of 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, background charge fluctuations were found to be an important channel of dephasing for a single Josephson qubit.
- 社団法人日本物理学会の論文
- 2004-12-15
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- Dephasing of Coupled Spin Qubit System during Gate Operations Due to Background Charge Fluctuations(Cross-disciplinary Physics and Related Areas of Science and Technology)
- Decoherence of a Spin Qubit Coupled with a Spin Chain