Center for Macroscopic Quantum Control & Department of Physics and Astronomy, Seoul National University, Seoul, Korea.
Phys Rev Lett. 2011 Jun 3;106(22):220401. doi: 10.1103/PhysRevLett.106.220401. Epub 2011 May 31.
Based on phase-space structures of quantum states, we propose a novel measure to quantify macroscopic quantum superpositions. Our measure simultaneously quantifies two different kinds of essential information for a given quantum state in a harmonious manner: the degree of quantum coherence and the effective size of the physical system that involves the superposition. It enjoys remarkably good analytical and algebraic properties. It turns out to be the most general and inclusive measure ever proposed that it can be applied to any types of multipartite states and mixed states represented in phase space.
基于量子态的相空间结构，我们提出了一种新的度量方法来量化宏观量子叠加。我们的度量方法同时以和谐的方式量化了给定量子态的两种不同的基本信息：量子相干度和涉及叠加的物理系统的有效大小。它具有显著的良好的分析和代数性质。事实证明，它是迄今为止提出的最通用和最全面的度量方法，可应用于任何类型的多部分态和相空间中表示的混合态。
