利用热平衡态超导电荷量子比特实现量子隐形传态

Quantum teleportation using superconducting charge qubits in thermal equilibrium

本文利用处于热平衡态的两个相同超导电荷量子比特纠缠态作为量子隐形传态的信道,给出标准量子隐形传态协议下传递单量子比特态和两量子比特态的纠缠以及非标准协议下传递单量子比特态时平均保真度的解析表达式,研究其随温度、约瑟夫森能等系统参数的变化情况.计算结果表明,在标准量子隐形传态协议下传递两量子比特之间的纠缠以及非标准量子隐形传态协议下传递单量子比特态时可以实现接近理想的量子隐形传态.

Is this paper we mainly investigate the effects of the temperature and Josephson energy on teleportation of one qubit state in both the standard and the non-standard protocols as well as the partial teleportation of an entangled state under the standard protocol via two identical superconducting charge qubits in thermal equilibrium as the teleportation channel, and give the analytical expression of the average fidelity. Our results show that the teleportation of one qubit state in non-standard protocol and the partial teleportation of entanglement in standard protocol can be almost perfect, indicating that quantum teleportation, with using superconducting charge qubits in thermal equilibrium as a quantum channel, is feasible in theory.