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Journal of Xinxiang University

Generation of Cluster State and Transmission of Quantum Information by Using Cavity QED

Ximing Fang

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

We proposes a protocol to prepare the entangled state for quantum information transmission in cavity QED.The protocol points out that the quantum information transmission can be realized after the entangled state is prepared.The quantum information transmission can also be realized to directlly communicate in the process of the entangled state preparation between atoms.

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We proposes a protocol to prepare the entangled state for quantum information transmission in cavity QED.The protocol points out that the quantum information transmission can be realized after the entangled state is prepared.The quantum information transmission can also be realized to directlly communicate in the process of the entangled state preparation between atoms.
Quantum entangled state is an important and useful physical resource,it plays a very important role in quantum computation and quantum communication.In the quantum communication,information processing is dependent on the quantum state and its evolution.In the various kinds of quantum states,quantum entangled state is the most important one,it is used to test the fundamental principles of quantum mechanics,and it also takes an important role in quantum communication,so the preparation and operation of quantum entangled state became especially important.This article introduced the theoretical method of cavity quantum electrodynamics(cavity QED) in the first,and then it tells the definition of quantum entangled state and how to measure it,based on it we introduced the specific process of two atoms entangled state and more than two atoms entangled state by the use of cavity QED under resonance interaction.Finally we introduced some important applications of the quantum entangled state in quantum information.
We present a scheme to generate cluster states with many atoms in cavity QED via Raman transition. In this scheme, no transfer of quantum information between the atoms and cavities is required, the cavity fields are only virtually excited and thus the cavity decay is suppressed during the generation of cluster states. The atoms are always populated in the two ground states. Therefore, the scheme is insensitive to the atomic spontaneous emission and cavity decay. We also show how to transfer quantum information from one atom to another.
For the sake of making this kind of useful quantum information resource of quantum entanglement.Here we propose a new prepare process on the foundation of the cavity quantum electrodynamics technique project of the resonance interaction,put forward a kind of making process that atom entangled state.Made to prepare two typical quantum entangled states in cavity QED: GHZ and W states of atoms,which belong to inequivalent classes of entangled states.GHZ state is maximally entangled state,while W states are non-maximally entangled states.They hold many interesting applications in quantum information processing and high-precision measurements.Therefore it is expected to be implemented with the current cavity QED experimental technology.
We propose an optical scheme to generate cluster states of atomic qubits, with each trapped in separate optical cavity, via atom-cavity-laser interaction. The quantum information of each qubit is encoded on the degenerate ground states of the atom, hence the entanglement between them is relatively stable against spontaneous emission. A single-photon source and two classical fields are employed in the present scheme. By controlling the sequence and time of atom-cavity-laser interaction, we show that the atomic cluster states can be produced deterministically.