Generation And Transfer Of Quantum State In Circuit QED

Quantum information science is a new interdiscipline. which concretely com-bines information science, quantum mechanics and engineering. Different from classical information, quantum information is encoded, transformed and computed depending on quantum coherence and entanglement. Quantum parallel algorithm-s, Shor algorithm. Grover algorithm and Quantum teleportation demonstrate the great advantages and prospects of quantum information science. However, quan-tum coherence is very fragile because of the unavoidable interaction between the quantum system and the environment, which brings huge difficulties to the im-plementation of quantum information processing. As a consequence, for many quantum operations, it is of great significance to investigate high-efficiency op-eration. In this paper, we mainly propose some efficient schemes for generating entangled states and transferring quantum state in circuit QED. The structure of this thesis is arranged as follows:The introduction of the quantum information science is presented in chapter 1.In chapter 2, we introduce some basic knowledge of quantum information science, including the definition of entanglement, some typical entangled states, three different quantum channels, as well as deducing the Bonn-Markov master equation.In chapter 3, we introduce the circuit QED system, including superconducting qubits and cavities.In chapter 4, we discuss how to prepare photonic NOON states and transfer an arbitrary qutrit state efficiently in circuit QEDFinally, we summarize all the research work and further researches are prospect-ed.