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Chinese Physics B

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

Xi Wu, Zhihua Chen, Yong Zhang, Yuehua Chen, Ming-Yong Ye, Xiu‐Min Lin

Published Jun 1, 2011• 1 citation
Publisher

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.

DOI
10.1088/1674-1056/20/6/060306

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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.
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A scheme is proposed for the realization of quantum SWAP gate in cavity QED.We consider two three-level atoms simultaneously interact with single-mode cavity in the case of large detuning.Moreover,two classical fields are used to perform the rotations on atoms.The operation and implement course are simple and handy.In addition,during the whole course,the cavity is only virtually excited,thus the decoherence time is greatly prolonged and the demand on the quality factor of the cavity is greatly reduced.Within the present cavity QED techniques,the scheme is realizable.