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Generation of Cluster States and Quantum Teleportation via Cavity QED

Author: ZhouYanLi
Tutor: YangLiJia
School: National University of Defense Science and Technology
Course: Physics
Keywords: Cluster states Teleportation Entangled Coherent States Ξ -type three- level atom Fidelity Cavity QDE
CLC: O431.2
Type: Master's thesis
Year: 2007
Downloads: 53
Quote: 0
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Abstract


Quantum entanglement is the most basic resources of quantum information science, plays a key role in quantum teleportation, quantum dense coding quantum key distribution and quantum computing. Studies have shown that the multi-particle entanglement is one of the prerequisites for the development of a quantum computer with super-computing power, a new multi-particle special entangled state - cluster states, has aroused concern. Quantum teleportation is a necessary step to achieve quantum communication and quantum computing, is a novel and important applications of quantum entanglement. This paper focuses on the problem of coherent state preparation and quantum teleportation of entangled cluster states based on cavity quantum electrodynamics (QED). Preparation of cluster states cavity OED cluster state preparation problem. Ξ-type three-level atom and cavity field in the the large detuning interactions under adiabatic evolution, were prepared by a multi-chambered cluster states and multi-cluster state, and extended to the preparation of the two-dimensional cluster states from the preparation of the one-dimensional cluster states . First, for a multi-chamber cluster states quantum bit (qubit) encoding the cavity field coherent states | ± α>, the effective suppression of decoherence due to photon absorption; multi-atom cluster states, a three-level atom the two lower energy level as a qubit, its atomic structure is more stable. Secondly, wood text using large detuning model to overcome the atomic spontaneous emission due to dissipation. In addition, the use of a two-dimensional cluster state preparation of two-dimensional cluster states reflect cluster state can link brings a great deal of flexibility to the preparation of the cluster state. Teleportation of entangled coherent state fidelity teleportation of entangled coherent states cavity OED. Using ecological evolution of large detuning of the atom-field interaction production, preparation of the quantum channel, and with the non-unitary operation to achieve quantum teleportation. Teleportation process, the receiver needs to be transmitted according to the sender to his classic local operation to restore the state to be transferred, but the non-orthogonal coherent states, these operations are not necessarily unitary This teleportation to the successful completion of the invisible brought difficulties certain extent. This article is operating by the addition of the auxiliary system by measuring the non-unitary fidelity to restore the state to be transferred, which focused on the non-unitary operation teleportation fidelity issues in the case. Studies have shown that, when the cavity spaces at the amplitude of the coherent states | α | is large enough, the proposed scheme is able to get close to 100% fidelity.

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
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