Mechanisms of decoherence in weakly anisotropic molecular magnets
Mechanisms of decoherence in weakly anisotropic molecular magnets
复制标题
弱各向异性分子磁体的退相干机制
作者：
Dobrovitski;Katsnelson;Harmon
研究了弱各向异性磁性分子（如V15）晶体中的退相干机制。我们发现一个重要的退相干因素是磁性分子间偶极相互作用的快速热波动。提出了一个模型来描述这种退相干源的影响。基于该模型的精确解，我们证明了在相对较高的温度下，大约0.5 K， V15分子中的量子相干性不会被抑制，并且原则上可以通过实验检测到。因此，这些分子可能是研究量子计算机中发生的物理过程的合适原型系统。
Decoherence mechanisms in crystals of weakly anisotropic magnetic molecules, such as V15, are studied. We show that an important decohering factor is the rapid thermal fluctuation of dipolar interactions between magnetic molecules. A model is proposed to describe the influence of this source of decoherence. Based on the exact solution of this model, we show that at relatively high temperatures, about 0.5 K, the quantum coherence in a V15 molecule is not suppressed and, in principle, can be detected experimentally. Therefore, these molecules may be suitable prototype systems for study of physical processes taking place in quantum computers.