Several Quantum Teleportation Schemes In The Cavity And Circuit QED

With the combining and development of information science and quantum mechanics, the quantum information science and technology,using the principle of superposition of states of quantum mechanics, has made great process in both theory and experiment because of its unique advantages, such as computing speed, the security of information transmission and so on. Among them, the quantum communication technology has been initially achieved utility by using quantum teleportation. In this field, the scientists in our country have been walking in the forefront of the world.Since the idea of teleportation proposed in 1993 by Bennett, the teleportation has been developed and studied quit a lot not only in the theory but also in the experiment. At the same time, the cavity quantum electrodynamics(cavity QED) and circuit quantum electrodynamics(circuit QED) as the most promising quantum systems have been widely studied and applied in various quantum information processing schemes.Therefor, the paper based on cavity QED and circuit QED presentsseveral schemes to achieve the quantum teleportation, mainly including the following several aspects.1. In the cavity QED, a scheme is presented to teleport an arbitrary single atomic state and an unknown entangled quantum state of two atoms. The scheme is insensitive to the cavity and the thermal field.2. Our paper present a simple scheme to teleport an unknown superconducting charge qubit in a circuit QED. The success probability of this scheme is 1.0.3. We present a scheme to teleport an unknown SQUID qubit, by placing SQUIDS in a microwave cavity. In this scheme, the cavity field is only virtually excited. Thus, the operation process is insensitive to the cavity decay.