Simple Scheme for Realizing the General Conditional Phase Shift Gate and a Simulation of Quantum Fourier Transform in Circuit QED

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.