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

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...

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Bibliographic Details
Published in:Chinese physics B 2011-06, Vol.20 (6), p.34-38, Article 060306
Main Author: 吴熙 陈志华 张勇 陈悦华 叶明勇 林秀敏
Format: Article
Language:English
Subjects:
Coding
Decay
Entanglement
Excitation
Gates
Holes
Spontaneous emission
Teleportation
原子自发辐射
多粒子
控制相
相互作用
纠缠
腔QED
量子位
隐形传输
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/6/060306