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Research PapersNo Access

REALIZATION OF THE GREENBERG–HORNE–ZEILINGER (GHZ) STATE AND SWAP GATE WITH SUPERCONDUCTING QUANTUM-INTERFERENCE DEVICES IN A CAVITY VIA ADIABATIC PASSAGE

College of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China

Institute of Material Modelling Computational Physics, China University of Geosciences, Wuhan 430074, China

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College of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China

Institute of Material Modelling Computational Physics, China University of Geosciences, Wuhan 430074, China

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Department of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

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College of Mathematics and Physics, China University of Geosciences, Wuhan 430074, China

Institute of Material Modelling Computational Physics, China University of Geosciences, Wuhan 430074, China

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https://doi.org/10.1142/S0217984908016224Cited by:1 (Source: Crossref)

Abstract

We propose an alternative scheme to prepare the Greenberg–Horne–Zeilinger (GHZ) state and realize a SWAP gate by using Superconducting Quantum-interference devices (SQUIDs) coupled to a cavity. The present scheme, based on the adiabatic evolution of dark state, constitutes a decoherence-free method in the sense that spontaneous emission and cavity damping are avoided. Besides, the standard GHZ state can be directly obtained without measurement or any auxiliary SQUIDs and the construction of the SWAP gate does not require a composition of elementary gates from a universal set. Thus the procedure is simplified and decoherence is greatly suppressed.

Keywords:

PACS: 03.67.Lx, 03.67.Mn, 42.50.Dv

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Vol. 22, No. 15

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Received 30 November 2007

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