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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Swapping transmit of quantum entanglement information in the process of unresonant interaction by intensity-dependent coupling

Wang Ju-xia

Published Feb 19, 2015• 0 citations
Publisher

Abstract

The unresonant procedure of the interaction of atoms with cavity-field by intensity-dependent coupling was analyzed in the union system consisting of multi-atom and multi-cavity using of the complete quantum theory. The results show that through controlling the time of cavity-field interacting with atoms and measuring the atomic states just being out of cavity, the quantum entangled information can be completely exchange between the atomic maximal entangled state and the maximal like-odd-even coherent entangled state. The quantum information can be completely swapping transmit on account of properly confining the detuning value. The process above mentioned display that the evolution is opposite each other in the close system.

DOI
10.1117/12.2075996

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The unresonant procedure of the interaction of atoms with cavity-field by intensity-dependent coupling was analyzed in the union system consisting of multi-atom and multi-cavity using of the complete quantum theory. The results show that through controlling the time of cavity-field interacting with atoms and measuring the atomic states just being out of cavity, the quantum entangled information can be completely exchange between the atomic maximal entangled state and the maximal like-odd-even coherent entangled state. The quantum information can be completely swapping transmit on account of properly confining the detuning value. The process above mentioned display that the evolution is opposite each other in the close system.
From the viewpoint of complete quantum theory,the process of the nonresonant interaction of atoms with cavity fields by intensity-dependent coupling was analyzed in the joint system consisting of multi-atom and multi-cavity.It is found that the quantum entanglement information can be completely interchanged between the atomic maximal entangled state and the maximal odd-even-like coherent entangled state by controlling the time of atoms interacting with cavity fields and measuring the atom states just being out of cavity.The quantum information can be completely swap by properly limiting the detuning value.The procedures mentioned above show that the process of evolution is reversible within the close system.
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.
From the viewpoint of quantum information theory, a multiatom and muticavity system was investigated. In the system the interaction between the atoms and the fi elds in the cavities is described by the intensity-dependent coupling Jaynes-Cummings model. It is found that the atomic maximal entangled state can be transformed into the maximal odd-even-like coherent entangled state, whereas the maximal odd-even-like coherent entangled state also can be transfor med into the atomic maximal entangled state.
The united system is analyzed by using of the viewpoint of quantum informatics.The system consists of many sub-system of multi-photon(N_k pho- tons)far-off resonant interaction of intensity-dependent coupling of two-level atoms with multi-mode(q modes)coherent state light field.It is found that initial quantum entangled information in the cavities or atoms can be completely preserved under only controlling the time(gt=/2)of the interaction of atoms with cavity fields.When q=1 and N_k=1,the results obtained will fit the special situation of single-mode single-photon interaction,which the author of this paper have studied recently.The quantum entangled information completely swapped under the simple condition.
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.