Communications in Theoretical Physics
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SHI Tao, CHEN Bing, and SONG Zhi
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Abstract: We revisit the harmonic approximation (HA) for a large Josephson junction interacting with some charge qubits through the variational approach for the quantum dynamics of the junction-qubit coupling system. By making use of numerical calculation and analytical treatment, the conditions under which HA works well can be precisely presented to control the parameters implementing the two-qubit quantum logical gate through the couplings to the large junction with harmonic oscillator Hamiltonian.
Key words: Josephson junction, charge qubits, harmonic approximation
PACS numbers:
SHI Tao, CHEN Bing, and SONG Zhi, Commun. Theor. Phys. 43 (2005) 795.
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https://ctp.itp.ac.cn/EN/Y2005/V43/I05/795
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