摘要
We propose a theoretical scheme for realizing the general conditional phase shift gate of charge qubitssituated in a high-Q superconducting transmission line resonator.The phase shifting angle can be tuned from 0 to 2n bysimply adjusting the qubit-resonator detuning and the interaction time.Based on this gate proposal,we give a detailedprocedure to implement the three-qubit quantum Fourier transform with circuit quantum electrodynamics (QED).Acareful analysis of the decoherence sources shows that the algorithm can be achieved with a high fidelity using currentcircuit QED techniques.
We propose a theoretical scheme for realizing the general conditional phase shift gate of charge qubits situated in a high-Q superconducting transmission line resonator. The phase shifting angle can be tuned from 0 to 27r by simply adjusting the qubit-resonator detuning and the interaction time. Based on this gate proposal, we give a detailed procedure to implement the three-qubit quantum Fourier transform with circuit quantum eleetrodynamics （QED）. A careful analysis of the decoherence sources shows that the algorithm can be achieved with a high fidelity using current circuit QED techniques.
基金
Supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China under Grant No. 200524
the Program for New Century Excellent Talents of China under Grant No. 06-0920
