论文标题
三方系统中量子相干分解和权衡关系的实验研究
Experimental study of quantum coherence decomposition and trade-off relations in a tripartite system
论文作者
论文摘要
量子相干性是所有量子量词中最基本的,它是其他众所周知的量子,例如纠缠,量子不一致和钟形相关性。它可以以各种方式分布在多方系统中 - 例如,在两分系统中,它可以存在于子系统(本地连贯性)中,也可以在子系统(全球连贯性)之间集体存在,并表现出权衡关系。在具有两个以上子系统的量子系统中,由于连贯性的各种分解方式,有更多的权衡关系。在本文中,我们通过使用自旋系统从产品状态更改为三方纠缠状态的状态,从实验中验证了绝热进化的量子系统中的这些连贯的权衡关系。我们研究了原始状态,双方产品状态,三方产品状态和磨刀产品状态之间的一系列连贯权衡关系。我们还实验验证了一夫一妻制的不平等,并表明两个量子系统都是一夫多妻制,除了初始产品状态。我们发现,尽管涉及不同类型的状态,但在一夫一妻制方面,状态的特性是等效的。这说明了使用连贯性作为量子状态的表征工具的实用性。
Quantum coherence is the most fundamental of all quantum quantifiers, underlying other well-known quantities such as entanglement, quantum discord, and Bell correlations. It can be distributed in a multipartite system in various ways -- for example, in a bipartite system it can exist within subsystems (local coherence) or collectively between the subsystems (global coherence) and exhibits a trade-off relation. In quantum systems with more than two subsystems, there are more trade-off relations, due to the various decomposition ways of the coherence. In this paper, we experimentally verify these coherence trade-off relations in adiabatically evolved quantum systems using a spin system by changing the state from a product state to a tripartite entangled state. We study the full set of coherence trade-off relations between the original state, the bipartite product state, the tripartite product state, and the decohered product state. We also experimentally verify the monogamy inequality and show that both the quantum systems are polygamous except for the initial product state. We find that despite the different types of states involved, the properties of the state in terms of coherence and monogamy are equivalent. This illustrates the utility of using coherence as a characterization tool for quantum states.