Realization of Simple Quantum Algorithms with Circuit Quantum Electrodynamics

Devin Underwood, Will Shanks, Andy C. Y. Li +4 more

M. Göppl

Changyong Chen, Qing Sun

Guillermo Romero, E. Solano, Lucas Lamata

Chun-Wang Wu, Yang Han, Zhi-Jiao Deng +3 more

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 2π 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 electrodynamics (QED). A careful analysis of the decoherence sources shows that the algorithm can be achieved with a high fidelity using current circuit QED techniques.

Lv Dan-Dan, H. Lu, Yu Ya-Fei +2 more

We propose a scheme for realizing the 1 → 2 universal quantum cloning machine (UQCM) with superconducting quantum interference device (SQUID) qubits in circuit quantum electrodynamics (circuit QED). In this scheme, in order to implement UQCM, we only need phase shift gate operation on SQUID qubits and the Raman transitions. The cavity number we need is only one. Thus our scheme is simple and has advantages in the experimental realization. Furthermore, both the cavity and the SQUID qubits are virtually excited, so the decoherence can be neglected.