Preparation of entangled states of four remote atomic qubits in decoherence-free subspace
Preparation of entangled states of four remote atomic qubits in decoherence-free subspace
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DOI：
10.1103/physreva.75.024302
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发表时间：
2007-02
影响因子：
2.9
通讯作者：
Z. Deng;M. Feng;K. Gao
中科院分区：
文献类型：
--
作者：
Z. Deng;M. Feng;K. Gao
我们提出了如何制备四个远程逻辑量子比特，每个量子比特在一个单独的腔中，由两个原子在无消相干子空间中编码，进入各种纠缠态。通过腔辅助光子散射，我们可以将不同腔中的四个远程逻辑量子比特分别连接到W态、Greenberger-Horne-Zeilinger态和团簇态，这对于分布式量子信息处理具有重要意义。后两种纠缠态的产生在理论上可以推广到多量子比特的情况。由于我们的量子比特定义在无退相子空间中，我们的方案在纠缠准备期间甚至之后都不受退相的影响。
We propose how to prepare four remote logical qubits, with each in a separate cavity and encoded in the decoherence-free subspace by two atoms, into various entangled states. By means of the cavity-assisted photon scattering, we can link the four remote logical qubits in different cavities to be, respectively, W state, Greenberger-Horne-Zeilinger state, and cluster state, which are important in view of the distributed quantum information processing. The generation of the latter two entangled states can be theoretically generalized to many-qubit cases. Because our qubits are defined in dephasing-free subspace, our scheme is immune to dephasing during or even after the entanglement preparation.