Several Quantum Information Processing Schemes Based On Josephson Junction

In recent years, with the integration and development of computer science and quantum physics, people began to pay attention to the quantum computer based on quantum mechanics. Compared with the classical computer, quantum computer has incomparable information processing ability, so how to use specific physical system to construct quantum computer has become the focus of attention of the scientific community.Different from the ion traps, cavity QED system, superconducting quantum computers encode information in the macroscopic state of the quantum nature of the Josephson junction device structure. Because of its good expansibility and easy operation, it is regarded as one of the most promising physical systems. By using the coupling of the superconducting qubit and the superconducting LC circuit, the superconducting transmission line and the nanoscale mechanical resonator, a variety of quantum logic gates and quantum entanglement states can be realized.This paper is mainly based on the solid-state superconducting circuit,study the interactions between different superconducting qubits and superconducting qubits and superconducting LC circuit, design a feasible scheme for preparing the iSWAP gate, cluster state, the specific contents are as follows:1. In the solid state superconducting circuit, nanoscale mechanical resonators are used to couple the superconducting charge qubit and the superconducting magnetic flux qubit to realize the preparation of iSWAP gate. By changing the magnetic flux passing through the charge qubit,the charge quantum and magnetic flux can be realized. Controllable coupling between the sub-bits.2. In the solid state superconducting circuit, the superconducting qubit and the superconducting LC circuit are used to prepare the cluster state theory. In this scheme, the superconducting LC circuit can be coupled with several magnetic flux qubit, and the cluster state can be realized by adjusting the parameters in one step. The feasibility of the experiment are discussed at last.