摘要We study the possibility of using a spin chain to construct a quantum entanglement channel that can be used for quantum state transmission in a solid state system. We analyze the spin chain's states under various z-directional magnetic field and spin interactions to determine the entanglement between Alice and Bob's spins. We derive the conditions under which this entanglement can be distilled, and find that a spin chain of arbitrary length can be used as a quantum channel for quantum state transmission when the number of spin flips in the chain is large.
Abstract：We study the possibility of using a spin chain to construct a quantum entanglement channel that can be used for quantum state transmission in a solid state system. We analyze the spin chain's states under various z-directional magnetic field and spin interactions to determine the entanglement between Alice and Bob's spins. We derive the conditions under which this entanglement can be distilled, and find that a spin chain of arbitrary length can be used as a quantum channel for quantum state transmission when the number of spin flips in the chain is large.
ZHANG Shao-Liang;DU Liang-Hui;GUO Guang-Can;ZHOU Xing-Xiang**;ZHOU Zheng-Wei**
. Quantum Entanglement Channel based on Excited States in a Spin Chain[J]. 中国物理快报, 2011, 28(12): 120301-120301.
ZHANG Shao-Liang, DU Liang-Hui, GUO Guang-Can, ZHOU Xing-Xiang**, ZHOU Zheng-Wei**
. Quantum Entanglement Channel based on Excited States in a Spin Chain. Chin. Phys. Lett., 2011, 28(12): 120301-120301.
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