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ACTA PHOTONICA SINICA

Quantum Discord in The System of W-like States Atoms Interacting with Three Coupled Cavities Connected by Two Optical Fibers

邱昌东 Qiu Changdong, 卢道明 LU Dao-ming

Published Jan 1, 2015• 0 citations
Publisher
DOI
10.3788/gzxb20154409.0927002

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The Geometrical Quantum Discord(GQD)is an effective measure of quantum correlation in quantum systems.The system of W-like states atoms interacting with three coupled cavities connected by two optical fibers was investigated.In the case of like-W state,optical cavities and fiber field are all in vacuum state initially.The evolution of the state vector of the system is given.GQD is adopted to quantify the degree of quantum discord between atoms.The GQD dynamics between atoms are discussed.The influences of coupling constant between cavity and fiber on geometrical quantum discord between atoms are discussed.The results show that GQD between atoms is strengthened with increasing of coupling constant between cavity and fiber.

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The Geometrical Quantum Discord(GQD)is an effective measure of quantum correlation in quantum systems.The system of W-like states atoms interacting with three coupled cavities connected by two optical fibers was investigated.In the case of like-W state,optical cavities and fiber field are all in vacuum state initially.The evolution of the state vector of the system is given.GQD is adopted to quantify the degree of quantum discord between atoms.The GQD dynamics between atoms are discussed.The influences of coupling constant between cavity and fiber on geometrical quantum discord between atoms are discussed.The results show that GQD between atoms is strengthened with increasing of coupling constant between cavity and fiber.
Geometrical quantum discord (GQD) is an effective measure of quantum correlation in quantum systems. We study GQD dynamics in an atom-cavity-fiber system. GQD between atoms and that between cavities are investigated. The influences of coupling constant between cavity and fiber and the intensity of the cavity field on GQD are discussed. Results show that GQD between atoms and that between cavities all display periodical evolutions, and their evolution frequencies increase with increasing coupling constant between cavity and fiber. On the other hand, the GQD between atoms and that between cavities are all strengthened with increasing intensity of the cavity field.