Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

doi:10.1088/1674-1056/20/6/060306

中国物理B ›› 2011, Vol. 20 ›› Issue (6): 60306-060306.doi: 10.1088/1674-1056/20/6/060306

Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

张勇¹, 吴熙², 陈志华², 陈悦华², 叶明勇², 林秀敏²

(1)Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China; (2)School of Physics and Optoelectronics Technology, Fujian Normal University, Fuzhou 350007, China

收稿日期:2010-10-07 修回日期:2010-12-27 出版日期:2011-06-15 发布日期:2011-06-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60878059, 10947147, 10574022, and 10704010) and the Natural Science Foundation of Fujian Province of China (Grant Nos. 2007J0002 and 2010J01002).

Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

Wu Xi(吴熙)^a), Chen Zhi-Hua(陈志华)^a), Zhang Yong(张勇)^b), Chen Yue-Hua(陈悦华)^a), Ye Ming-Yong(叶明勇)^a), and Lin Xiu-Min(林秀敏)^a)†

^a School of Physics and Optoelectronics Technology, Fujian Normal University, Fuzhou 350007, China; ^b Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2010-10-07 Revised:2010-12-27 Online:2011-06-15 Published:2011-06-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60878059, 10947147, 10574022, and 10704010) and the Natural Science Foundation of Fujian Province of China (Grant Nos. 2007J0002 and 2010J01002).

摘要/Abstract

摘要： Schemes are presented for realizing quantum controlled phase gate and preparing an N-qubit W-like state, which are based on the large-detuned interaction among three-state atoms, dual-mode cavity and a classical pulse. In particular, a class of W states that can be used for perfect teleportation and superdense coding is generated by only one step. Compared with the previous schemes, cavity decay is largely suppressed because the cavity is only virtually excited and always in the vacuum state and the atomic spontaneous emission is strongly restrained due to a large atom-field detuning.

关键词: phase gate, W states, cavity QED

Abstract: Schemes are presented for realizing quantum controlled phase gate and preparing an N-qubit W-like state, which are based on the large-detuned interaction among three-state atoms, dual-mode cavity and a classical pulse. In particular, a class of W states that can be used for perfect teleportation and superdense coding is generated by only one step. Compared with the previous schemes, cavity decay is largely suppressed because the cavity is only virtually excited and always in the vacuum state and the atomic spontaneous emission is strongly restrained due to a large atom-field detuning.

Key words: phase gate, W states, cavity QED

中图分类号: (Quantum information)

03.67.-a

31.30.J- (Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions) 42.50.-p (Quantum optics)

吴熙, 陈志华, 张勇, 陈悦华, 叶明勇, 林秀敏. Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED[J]. 中国物理B, 2011, 20(6): 60306-060306.

Wu Xi(吴熙), Chen Zhi-Hua(陈志华), Zhang Yong(张勇), Chen Yue-Hua(陈悦华), Ye Ming-Yong(叶明勇), and Lin Xiu-Min(林秀敏). Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED[J]. Chin. Phys. B, 2011, 20(6): 60306-060306.

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Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

Implementation of quantum controlled phase gate and preparation of multiparticle entanglement in cavity QED

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