Quantum-information processing in strong-excitation regime with trapped ions in microcavity

摘要

A quantum information processing scheme is proposed in a system with cold trapped ions embedded in a single mode microcavity in strong excitation regime. With suitable choice of frequencies of the laser and the cavity light as well as ion-laser coupling strength, multipartite entanglement would be generated among internal states of the ions, which is insensitive to decoherence due to the cavity decay and heating of the vibrational mode of the ions. As a practical example, the specific discussion is focused on the two-ion case. Some unique features of the Bell states are presented under the framework of our model, which would be useful for quantum information processing.