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arXiv 1208.5459quant-ph
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工程分子磁体中高温纠缠的证据

Evidence for entanglement at high temperatures in an engineered molecular magnet

M. S. Reis, S. Soriano, A. M. dos Santos, B. C. Sales, D. O. Soares-Pinto, P. Brandao

发表信息：
EPL 100, 50001 (2012)
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摘要：

首次设计并合成了分子化合物[Fe $_{2}$（$μ_{2}$-oxo）（C $_{3}$ H $_{4}$ N $_{2}$）$_{6}$（C $_{2}$ O $_{4}$）$_{2}$]，并用X射线单晶衍射法测定了其结构。在2~300 K范围内测定了该化合物的磁化率。使用为其他自旋单重基态系统开发的协议对磁化率数据进行的分析表明，量子纠缠将保持在高达732 K的温度下，显著高于迄今报道的最高纠缠温度。基态和第一激发态（282 K）之间的大间隙表明自旋系统可能对退散机制有一定的免疫力。我们的测量结果表明，分子磁体是量子信息处理的有前途的候选平台。

英文摘要：

The molecular compound [Fe$_{2}$($μ_{2}$-oxo)(C$_{3}$H$_{4}$N$_{2}$)$_{6}$(C$_{2}$O$_{4}$)$_{2}$] was designed and synthesized for the first time and its structure was determined using single-crystal X-ray diffraction. The magnetic susceptibility of this compound was measured from 2 to 300 K. The analysis of the susceptibility data using protocols developed for other spin singlet ground-state systems indicates that the quantum entanglement would remain at temperatures up to 732 K, significantly above the highest entanglement temperature reported to date. The large gap between the ground state and the first-excited state (282 K) suggests that the spin system may be somewhat immune to decohering mechanisms. Our measurements strongly suggest that molecular magnets are promising candidate platforms for quantum information processing.

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