论文标题
表征自旋链中的量子相关性
Characterizing quantum correlations in spin chains
论文作者
论文摘要
对精确制作的旋转多体系统的需求增长为$ 1/2 $颗粒/Quarbits是由于它们在面向应用程序的量子增强方案中的顶级多功能性以及量子理论的基本测试所致。在这里，我们解决了一个问题：旋转链的量子如何？我们证明密度矩阵的一个元素带有答案。对其进行了适当的分析，它带来了有关多体纠缠和非局部性程度的信息。该方法可用于在多体系统中量身定制和见证高度非古典效应，并可能应用量子计算，超专有计量学或量子力学的大规模测试。作为原则的证明，我们研究了基态和实验可访问的旋转链的基础状态和热状态下的非本地性和纠缠的扩展。
The growth in the demand for precisely crafted many-body systems of spin-$1/2$ particles/qubits is due to their top-notch versatility in application-oriented quantum-enhanced protocols and the fundamental tests of quantum theory. Here we address the question: how quantum is a chain of spins? We demonstrate that a single element of the density matrix carries the answer. Properly analyzed it brings information about the extent of the many-body entanglement and the non-locality. This method can be used to tailor and witness highly non-classical effects in many-body systems with possible applications to quantum computing, ultra-precise metrology or large-scale tests of quantum mechanics. As a proof of principle, we investigate the extend of non-locality and entanglement in ground states and thermal states of experimentally accessible spin chains.
