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

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

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.

Keywords: phase gate W states cavity QED

Received: 07 October 2010
Revised: 27 December 2010
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	31.30.J-	(Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions)
	42.50.-p	(Quantum optics)

Fund: 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).

Cite this article:

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 2011 Chin. Phys. B 20 060306

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

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