Influence Of Phase Decoherence On Quantum Teleportation Fidelity

In this paper, cavity QED as an investigation subject, based on the research foundation of Jaynes- Cummings(JC) Model, the decoherence and fidelity are studied via completely quantum theory.Firstly, we introduce the background and progress of quantum information. Secondly, we summarize the definition of entangled state, fidelity and the physical source of decoherence. Thirdly, we discuss state evolution of Jaynes-Cummings models and introduce several Jaynes-Cummings models widely spread out. Lastly, the fidelities of quantum teleportation in the system of an atom couples to two distinct optical cavities with phase decoherence are studied. The influence of phase decoherence rate and detuning parameter on the fidelity of quantum teleportation are discussed and we obtain the maximal fidelity over this entangled channel. In addition, the average fidelity of quantum teleportation is further analyzed.The result shows that:1. Detuning and phase decoherence have influence on maximal entangled fidelity for a arbitrary pure input state.2. The fidelity of maximal entangled state is larger than 2/3, so the entangled channel is useful.3. The average fidelity can be improved by adjusting phase decoherence and detuning. If we can control freely system decoherence , we can realize quantum communication andquantum computer. So it is a primary signification to whether control decoherence or not. In this paper, we can control the fidelity by controlling phase decoherence, which can enlighten in theory well on studying quantum communications and developing quantum computer.