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ACTA PHOTONICA SINICA

A Way of Transmitting Quantum Entangled Information Between Multimode Cavity Fields and Coupling Atoms

Yang Zhi-yong

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

A physical system which consists of the multimode cavity fields and the coupling atoms was proposed.In this system,a novel way of translating quantum entangled information has been discovered.The atoms can get the quantum entangled information stored in the entangled state of the cavity field when the atoms,which all are initially in ground state,cross the cavities with a controlled speed.And the atoms can release the quantum entangled information into the vacuum state cavities when the entangled state atoms cross the cavities.By this means,one can realize the entangled information exchange between cavities and atoms.The quantum entangled information transferring between two sets cavities was also discussed using the atomic properties which the atoms can pick up and release quantum entangled information. Besides,the quantum information can be preserved under the different time conditions.

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A physical system which consists of the multimode cavity fields and the coupling atoms was proposed.In this system,a novel way of translating quantum entangled information has been discovered.The atoms can get the quantum entangled information stored in the entangled state of the cavity field when the atoms,which all are initially in ground state,cross the cavities with a controlled speed.And the atoms can release the quantum entangled information into the vacuum state cavities when the entangled state atoms cross the cavities.By this means,one can realize the entangled information exchange between cavities and atoms.The quantum entangled information transferring between two sets cavities was also discussed using the atomic properties which the atoms can pick up and release quantum entangled information. Besides,the quantum information can be preserved under the different time conditions.
The physical model composed of coherent multimode cavity-field interacting with coherent coupling-atom is proposed. The evolution properties for the process of multi-photon interaction in the system mentioned above are studied by utilizing complete quantum theory. It shows that multiphoton entangled states and multi-atom entangled states can be swapped into each other periodically in the process of coupling multi-atoms interacting with multimode cavity-fields. Meanwhile the entanglement information transfer can be realized in the above process. The results of the entanglement transfer are thereby illustrated by means of calculating the fidelity of atoms numerically. And the general characteristics of the entangled information transfer are further revealed. It is pointed out that the results reported up to now are only specific examples of the research under different conditions.
From the viewpoint of the quantum information theory,the J-C Model of an atom interacting with a single-model light-field is expanded to a union physical system model which consists of M(where M is any positive integer) pairs of two-level atoms and the M cavity-field with interaction respectively.By solving the evolution matrix of the system state vector,the process of the atoms interacting with the light-field is studied and the principle of exchange and preservation of quantum entanglement information in this system is discussed.It is found that not only the atom entanglement but also the light-field entanglement can be transferred and preserved under different time conditions.At the same time,the different form entanglement states can be prepared by using the interaction of the atoms with the cavity-field.
The physics system consisting of coherent coupled-atom interaction with coherent single-mode cavity-field is proposed. Using the complete quantum theory, the evolution process of the system is studied. It is found that the quantum atom entangled states and light field entangled states can be transferred into each other under a certain temporal condition. Otherwise, the initial state of the atom or the light field entangled states can be completely preserved by controlling the time of the atoms interaction with the light fields.
A interaction model of multi-photon process in the“multi-coupled-atom-cavity”system is constructed.In terms of the cavity quantum electrodynamics,the properties of quantum information transfer in the process of coupled atoms interacting with cavity fields are studied,and the effect of the coupling between atoms on the quantum information transfer is analyzed.It is found that quantum information can be transferred back and forth or be preserved between the cavity fields and atoms in certain time period.The dipole interaction between atoms leads to the quantum entanglement information partially transferred and partially preserved.
Using of complete quantum theory,an united physical model which consist of the multi-atom and multi-cavity field is proposed.In this system,the procedure of multi-photon interaction by the intensity-dependent coupling is studied in detail.It is found that the quantum entangled information can be reciprocated between atoms and cavity fields if atoms cross the cavities with a controlled speed.The information can be completely transmitted under some conditions.Besides,the results of calculation entanglement degree are entirely same with above mentioned.