EFFICIENT SCHEME FOR EPR STATE AND CLUSTER STATES GENERATION WITH SQUID QUBITS VIA RAMAN TRANSITION

Abstract

In this paper, a theoretical scheme is proposed to generate the EPR state of two SQUID qubits and create the multipartite cluster states of many SQUID qubits in cavity via Raman transition. We also show how to transfer quantum information from one SQUID qubit to another directly. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The quantum information processing and cluster states generation are realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized.