On Harmonic Approximation for Large Josephson Junction Coupling Charge Qubits |
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Authors: | SHI Tao CHEN Bing SONG Zhi |
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Institution: | Department of Physics, Nankai University, Tianjin 300071, China |
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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. |
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Keywords: | Josephson junction charge qubits harmonic approximation |
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