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Jiguang zazhi

The complete preservation of quantum entanglement information under detuning

Yuying An

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

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.

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Chinese Journal of Quantum Electronics•Jan 1, 2008•0 citations
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.
Using the complete quantum theory，the process of M two-level atoms interacting with M multi-mode light fields with intensity-dependent coupling is studied. It is found that quantum entanglement information can be transferred back and forth or be preserved between the cavity fields and atoms under certain time conditions. The entanglement states of the atoms or the cavities can be transferred when t=π/(2λ). The results are verified by numerically computing the entanglement degree. And it was shown that the entanglement states of the atoms or the cavities can be preserved when t=π/λ.
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.
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.
Using the method of time-evolution operator,the time evolution properties of the system of identical two-level atoms dipole interacting resonantly with a single-mode cavity field in detail by means of quantum theory is discused.The influence of dipole-dipole interaction on the transfer and preservation of quantum entanglement information is analyzed.The calculation and analysis indicates that the procedure of the swap and conservation of quantum information depends on the initial of the atoms.For W type atoms,the initial entangled information of atoms or photons are contpletely conserved under dipole-dipole interaction intensity satisfying some conditions.It appears also the phenomenon of part exchange and preservation besides some mix entangled states under different conditions.The dipole-dipole interaction doesn't effect on transfer and preservation for GHZ type atom entangled states.
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.