铁磁和反铁磁材料中的超量子不和谐
Super-quantum discord in ferromagnetic and antiferromagnetic materials
摘要：
超量子不和谐是量子不和谐概念的扩展，其中进行弱测量而不是投影测量。我们研究了两种实际磁性材料的超量子不和谐的温度行为。我们从铁亚硝酰基配合物$\mathrm{ Fe_2(SC_3 H_5N_2)_2(NO)_4}$和双核Cu（II）乙酸盐配合物$\mathrm{[Cu_2 L(OAc)]\cdot 6 H_2O}$的磁化率数据中提取有关超量子不和谐的信息，其中$\mathrm{ L}$是一个配体，使我们能够将超量子不和谐与标准的进行比较。研究了超量子不和谐对弱测量参数的依赖性。超量子和量子不和谐之间的差异证实了检测到额外的量子相关性，这些相关性通常在投影测量过程中被破坏。该方法的使用允许提前定量地预测使用弱测量相对于投影测量在量子不和谐被用作资源的真实环境中用于量子技术的优点。这在宏观量子系统中尤其相关，在宏观量子系统中，弱测量可以用来提取关于系统的信息。
英文摘要：
Super-quantum discord is an extension of the quantum discord concept where weak measurements are made instead of projective measurements. We study the temperature behavior of the super-quantum discord for two real magnetic materials. We extract information about super-quantum discord from the magnetic susceptibility data for iron nitrosyl complexes $\mathrm{ Fe_2(SC_3 H_5N_2)_2(NO)_4}$ and binuclear Cu(II) acetate complex $\mathrm{[Cu_2 L(OAc)]\cdot 6 H_2O}$, where $\mathrm{ L}$ is a ligand that allows us to compare the super-quantum discord with the standard one. The dependence of the super-quantum discord on the parameter describing weak measurements is studied. Obtained difference between super-quantum and quantum discords confirms the detection of additional quantum correlations that are usually destroyed during projective measurements. The use of the approach allows to predict quantitatively in advance the advantages of use of weak measurements versus projective one for quantum technologies in real settings where quantum discord is used as resource. This can be relevant particularly in macroscopic quantum systems where weak measurements can be used to extract information about the system.
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