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Preparation of W State with Superconducting Quantum-Interference Devices in a Cavity via Adiabatic Passage |
| ZHENG An-Shou1;SHEN Xiao-Fang2;LIU Ji-Bing3;BI Jie1,3;DU Qiu-Jiao1,2 |
| 1College of Mathematics and Physics, China University of Geosciences, Wuhan 4300742Department of Mathematics, Huazhong University of Science and Technology, Wuchang 4300643Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 |
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ZHENG An-Shou, SHEN Xiao-Fang, LIU Ji-Bing et al 2008 Chin. Phys. Lett. 25 1195-1197 |
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Abstract We propose an alternative scheme to prepare W state by using superconducting quantum-interference devices (SQIDs) coupled to a largely-detuned cavity. The present scheme is based on evolution by adiabatic passage, where only by tuning adiabatically the Rabi frequencies of the classical microwave pulses we can obtain the standard W state without measurement or any auxiliary SQUIDs. Thus the procedure is simplified and the scheme can be achieved with very high success probability since the errors in dynamical or geometric ways can be avoided. In addition, the SQUID system and the cavity have no probability of being excited state. Thus decoherence caused by the excited-level spontaneous emission or the cavity decay is suppressed.
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| Keywords:
03.67.Mn
85.25.Dq
42.50.Dv
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Received: 18 August 2007
Published: 31 March 2008
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| PACS: |
03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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85.25.Dq
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(Superconducting quantum interference devices (SQUIDs))
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42.50.Dv
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(Quantum state engineering and measurements)
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