论文标题
基于宏观量子的相干表征
Coherence Based Characterization of Macroscopic Quantumness
论文作者
论文摘要
量子力学中最难以捉摸的问题之一是经典物理和量子物理学之间的过渡。这个问题可以追溯到Schrödinger的猫。这个问题中心的关键要素是缺乏对宏观量子状态的明确理解和表征。我们对宏观量子性的理解依赖于诸如Greenberger-Horne-Zeilinger（GHz）或中午状态之类的状态。在这里，我们采用第一个原则方法来解决这个问题。我们从连贯性开始，是捕获量子性概念的关键数量，并要求量子性是集体和宏观的。为此，我们引入了宏观连贯性，这是宏观上不同量子状态之间的相干性。我们构建了一种量化的措施，该措施量化了国家的一致性的全球和集体。我们的工作还提供了一种原则方法，可以推广诸如GHZ和中午国家等良好国家，作为最大化我们措施的国家。这种新方法为更好地理解量子到古典过渡铺平了道路。
One of the most elusive problems in quantum mechanics is the transition between classical and quantum physics. This problem can be traced back to the Schrödinger's cat. A key element that lies at the center of this problem is the lack of a clear understanding and characterization of macroscopic quantum states. Our understanding of Macroscopic Quantumness relies on states such as the Greenberger-Horne-Zeilinger(GHZ) or the NOON state. Here we take a first principle approach to this problem. We start from coherence as the key quantity that captures the notion of quantumness and demand the quantumness to be collective and macroscopic. To this end, we introduce macroscopic coherence which is the coherence between macroscopically distinct quantum states. We construct a measure that quantifies how global and collective the coherence of the state is. Our work also provides a first-principle way to derive well-established states like the GHZ and the NOON state as the states that maximize our measure. This new approach paves the way towards a better understanding of the Quantum-to-Classical transition.
