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Quantum logic gates operation using SQUID qubits in bimodal cavity

Chinese Physics B 2006年第2期15卷 286-291页

作者：宋克慧 Department of Physics and Electronic Information Science Huaihua University Huaihua 418008 China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 23026 China

We present a scheme to realize the basic two-qubit logic gates such as the quantum phase gate and SWAP gate using a detuned microwave cavity interacting with three-level superconducting-quantum-interference-device （SQUID） qubit（s）, by placing SQUID（s） in a two-mode microwave cavity and using adiabatic passage methods. In this scheme, the two logical states of the qubit are represented by the two lowest levels of the SQUID, and the cavity fields are treated as quantized. Compared with the previous method, the complex procedures of adjusting tile level spacing of the SQUID and applying the resonant microwave pulse to the SQUID to create transformation are not required. Based on superconducting device with relatively long decoherence time and simplified operation procedure, the gates operate at a high speed, which is important in view of decoherence.

关键词： superconducting-quantum-interference-device bimodal cavity adiabatic passage quantum logic gate

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Engineering three-dimensional maximally entangled states for two modes in a bimodal cavity

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Chinese Physics B 2007年第2期16卷 435-440页

作者：杨贞标苏万钧 Department of Electronic Science and Applied Physics Fuzhou University Fuzhou 350002 China

An alternative scheme is proposed for engineering three-dimensional maximally entangled states for two modes of a superconducting microwave cavity. In this scheme, an appropriately prepared four-level atom is sent through a bimodal cavity. During its passing through the cavity, the atom is coupled resonantly with two cavity modes simultaneously and addressed by a classical microwave pulse tuned to the required transition. Then the atomic states are detected to collapse two modes onto a three-dimensional maximally entangled state. The scheme is different from the previous one in which two nonlocal cavities are used. A comparison between them is also made,

关键词： three-dimensional entanglement bimodal cavity

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A scheme for conditional quantum phase gate via bimodal cavity and a∧-type three-level atom

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Chinese Physics B 2006年第11期15卷 2518-2522页

作者：蔡建武方卯发廖湘平郑小娟 College of Physics and Information Science Hunan Normal University Changsha 410081 China Department of Physics Science and Electronics Zhuzhou Teacher' College Zhuzhou 412007 China

We propose a scheme to implement a two-qubit conditional quantum phase gate for the intracavity field via a single three-level ∧-type atom driven by two modes in a high-Q cavity. The quantum inforraation is encoded o... 详细信息

关键词： quantum phase gate ∧-type three-level atom bimodal cavity fidelity

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Generation of cluster states for cavity fields

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Chinese Physics B 2008年第11期17卷 4207-4210页

作者：贾连军杨贞标吴怀志郑仕标 Department of Physics Lanzhou University Department of Electronic Science and Applied Physics Fuzhou University

This paper proposes an alternative scheme for generating cluster-type of entangled coherent states. This scheme is based on resonant interaction of a two-mode cavity with a two-level atom driven by strong classical fi... 详细信息

关键词： cluster state coherent state bimodal cavity

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