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Acta Optica Sinica

Influences of Selective Atomic Measurement on Entanglement Properties in a System of Atoms Interacting with Coupled Cavities

卢道明 Lu Daoming

Published Jan 1, 2011• 0 citations
Publisher
DOI
10.3788/aos201131.0727002

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In this paper,we consider the situation that two of three identical two-level atoms are trapped in two coupled cavities separately and another atom is outside the cavity.The evolution of the state vector of the system is given.Three atoms are in like-W state,and optical cavities are all in vacuum state initially.Negativity is adopted to quantify the degree of entanglement.By means of the numerical calculations,we investigate the temporal evolutions of the entanglement between atoms.The influences of coupling constant between cavities and the parameter describing the atomic initial state on the entanglements are discussed.The results show that the disentanglement time zone of atom-atom entanglement is reduced,and the curve peaks of entanglements increase as initial entanglement between atoms increases.This indicates that the entanglement between atoms is strengthened with the increase of initial entanglement between atoms.The atom-atom entanglement is also strengthened with the increase of the coupling constant between cavities.On the other hand,we consider the case which the state of atom outside cavity is measured.When a direct selective measurement is performed or not,the effect of the state-selective measurement on the entanglement is discussed.We find that the entanglement between atoms can be strengthened through the state-selective measurement.

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Selective Atomic Measurement to Influences of Entanglement Properties

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Considering three two-level atoms initially in the W state,two atoms of the three atoms were put into initially empty cavity and made resonant interaction.The atom-cavity entanglement evolution and entanglement evolution between two cavities were investigated.The influences of state-selective measurement of the atom outside cavity on entanglement properties were discussed.The results obtained using the numerical method show that atom-cavity entanglement property and entanglement property between two cavities are strengthened through the state-selective measurement of the atom outside the cavity.

Natural Science Journal of Xiangtan University•Jan 1, 2011•0 citations
In this paper,we consider the situation that two of three identical two-level atoms are trapped in two coupled cavities separately and another atom is outside the cavity.The evolution of the state vector of the system is given.Three atoms are in like-W state,and optical cavities are all in vacuum state initially.Negativity is adopted to quantify the degree of entanglement.By means of the numerical calculations,we investigate the temporal evolutions of the entanglement between atoms.The influences of coupling constant between cavities and the parameter describing the atomic initial state on the entanglements are discussed.The results show that the disentanglement time zone of atom-atom entanglement is reduced,and the curve peaks of entanglements increase as initial entanglement between atoms increases.This indicates that the entanglement between atoms is strengthened with the increase of initial entanglement between atoms.The atom-atom entanglement is also strengthened with the increase of the coupling constant between cavities.On the other hand,we consider the case which the state of atom outside cavity is measured.When a direct selective measurement is performed or not,the effect of the state-selective measurement on the entanglement is discussed.We find that the entanglement between atoms can be strengthened through the state-selective measurement.
Considering three two-level atoms initially in the W state,two atoms of the three atoms were put into initially empty cavity and made resonant interaction.The atom-cavity entanglement evolution and entanglement evolution between two cavities were investigated.The influences of state-selective measurement of the atom outside cavity on entanglement properties were discussed.The results obtained using the numerical method show that atom-cavity entanglement property and entanglement property between two cavities are strengthened through the state-selective measurement of the atom outside the cavity.