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arXiv quant-ph/0610210quant-phcond-mat.other
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自旋1链中的量子态转移

Quantum State Transfer in Spin-1 Chains

O. Romero-Isart, K. Eckert, A. Sanpera

摘要:

研究了自旋为1的海森堡链在其基态中的量子信息传递。我们测量了这样一个量子信道的效率{ \em via}恢复一个任意准备状态的保真度和{ \em via}传递量子纠缠。海森堡自旋1链有一个非常丰富的量子相图。我们表明,相边界反映在急剧变化的传输效率。在附近的二聚体和铁磁相之间的边界(在自旋束缚区),我们发现强烈的迹象,激发光谱的定性变化。此外,我们确定了两个区域的相图,从而产生特别高的传输效率,该通道可能是非经典的,即使是任意长度的链,与自旋1/2链。

英文摘要:

We study the transfer of quantum information through a Heisenberg spin-1 chain prepared in its ground state. We measure the efficiency of such a quantum channel {\em via} the fidelity of retrieving an arbitrarily prepared state and {\em via} the transfer of quantum entanglement. The Heisenberg spin-1 chain has a very rich quantum phase diagram. We show that the phase boundaries are reflected in sharp variations of the transfer efficiency. In the vicinity of the border between the dimer and the ferromagnetic phase (in the conjectured spin-nematic region), we find strong indications for a qualitative change of the excitation spectrum. Moreover, we identify two regions of the phase diagram which give rise to particularly high transfer efficiency; the channel might be non-classical even for chains of arbitrary length, in contrast to spin-1/2 chains.

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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