A Scheme for Atomic Entangled States and Quantum Gate Operations in Cavity QED

Pengbo Li, Ying Gu, Gong Qi-Huang +1 more

We propose a scheme for controllably entangling the ground states of five-state W-type atoms confined in a cavity and realizing swap gate and phase gate operations. In this scheme the cavity is only virtually excited and the atomic excited states are almost not occupied, so the produced entangled states and quantum logic operations are very robust against the cavity decay and atomic spontaneous emission.

Zhenglu Duan, Zhen-Qi Chen, J.-T. Zhang +2 more

Liu Ye, Guang‐Can Guo

Rong Wang, Jin-Yue Gao

We present a scheme to realize entangled states, swap gate and quantum-information transfer for two atoms in cavity QED. The scheme does not require the transfer of quantum information between the atoms and cavity and that the cavity field is only virtually excited, thus the requirement on the quality factor of the cavity is greatly loosened.

Shi‐Biao Zheng

We propose a robust scheme for the implementation of two-qubit phase gates with a cavity QED system. After the gate operation the computational basis states are equally damped by the decoherence effect and thus the gate error is suppressed. The scheme is based on resonant atom–cavity interaction and thus the operation speed is high. During the atom–cavity interaction no external laser fields are required and thus the gate errors arising from external sources are suppressed.

Yue Xu, Yuanhua Li