On the Harmonic approximation for large Josephson junction coupling charge qubits

Details On the Harmonic approximation for large Josephson junction coupling charge qubits On the Harmonic approximation for large Josephson junction coupling charge qubits

2004-09-02

arxiv.org/abs/quant-ph/0409013v2

Comm. Theor. Phys. 43 795(2005)

Physics

Quantum Physics

7 pages, 3 figures

Scientific paper

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 (HO) Hamiltonian.

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