Quantum coherence effects in a four-level diamond-shape atomic system |
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| Authors: | Bao-Quan Ou Lin-Mei Liang Cheng-Zu Li |
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| Affiliation: | Department of Physics, Science College, National University of Defense Technology, Yan WaChi Street, ChangSha City, Hunan 410073, China |
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| Abstract: | A symmetric four-level closed-loop ? type (the diamond-shape) atomic system driven by four coherent optical fields is investigated. The system shows rich quantum interference and coherence features. When symmetry of the system is broken, interesting phenomena such as single and double-dark resonances appear. As a result, the controllable double electromagnetically induced transparency (EIT) effect is generated, which will facilitate the implementation of quantum phase gate (QPG) operation. |
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| Keywords: | 42.50.Gy 42.50.Nn 42.50.Ex |
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