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Chinese Journal of Quantum Electronics

Emission properties of atoms inside a cavity when manipulating the atoms outside the cavity

Shi Shou-Hua

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

Considering two two-level atoms initially in the non-maximally entangled state, one of them is put into an initially empty cavity and resonant interaction occurs. It is shown that the emission properties of the atom inside the cavity will be affected when the other atom outside the cavity is manipulated. And the degree of entanglement of the atoms can also affect the emission properties. This conclusion is generalized to the situation of the two-mode squeezed property of two cavities interacting with three two-level atoms.

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Considering two two-level atoms initially in the non-maximally entangled state, one of them is put into an initially empty cavity and resonant interaction occurs. It is shown that the emission properties of the atom inside the cavity will be affected when the other atom outside the cavity is manipulated. And the degree of entanglement of the atoms can also affect the emission properties. This conclusion is generalized to the situation of the two-mode squeezed property of two cavities interacting with three two-level atoms.
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Considering three two-level atoms initially in the GHZ state,two atoms of the three atoms are put into initially empty cavity and made resonant interaction.The two-atom entanglement properties inside cavities are investigated by means of the quantum theory and numerical calculations.Through comparing the results if a rotation operation and direct selective measurement is performed or not,the influences of a rotation operation and state-selective measurement of the atom outside the cavity on the two-atom entanglement evolution inside cavities are discussed.The results obtained using the numerical method show that the two-atom entanglement properties inside cavities is controlled by manipulating the atom outside the cavity,and it can be strengthened by seleting suitable rotation angle.
For the interaction of two entangled atoms with the two-mode squeezed light field,the entanglements between the atom with the light field and that between the two-modes of the light field are studied.Setting that one atom is outside the cavity and the other atom enters the cavity to interact with the light field,generally the entanglement changes periodically and the period is not affected by the rotation angle of the outside atom and the phase difference in the atomic entangled state.But,if the squeezing parameter of the light field and the rotation angle of the atom outside the cavity satisfy a certain relation,atom and the light field will be disentangled forever.