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arXiv quant-ph/0406159quant-phcond-mat.str-el
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通过作为鲁棒数据总线的自旋梯的量子态传输

Quantum state transmission via a spin ladder as a robust data bus

Y. Li, T. Shi, B. Chen, Z. Song, C. P. Sun

摘要:

通过将两个自旋连接到一个各向同性反铁磁自旋梯系统上作为数据总线,探讨了相干传输自旋量子信息的物理机制。由于理想介质中存在较大的自旋能隙,两个相连自旋的有效哈密顿量可以表现为海森堡型哈密顿量,它具有一个最大纠缠的基态.我们证明了有效耦合强度与两个自旋之间的距离成反比,因此量子信息可以在相隔较长距离的两个自旋之间传递,即量子态转移的特征时间与距离成线性关系.

英文摘要:

We explore the physical mechanism to coherently transfer the quantum information of spin by connecting two spins to an isotropic antiferromagnetic spin ladder system as data bus. Due to a large spin gap existing in such a perfect medium, the effective Hamiltonian of the two connected spins can be archived as that of Heisenberg type, which possesses a ground state with maximal entanglement. We show that the effective coupling strength is inversely proportional to the distance of the two spins and thus the quantum information can be transferred between the two spins separated by a longer distance, i.e. the characteristic time of quantum state transferring linearly depends on the distance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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