Cavalcanti E G, Reid M D
ARC Centre of Excellence for Quantum-Atom Optics, School of Physical Sciences, The University of Queensland, St. Lucia 4072, Queensland, Australia.
Phys Rev Lett. 2006 Oct 27;97(17):170405. doi: 10.1103/PhysRevLett.97.170405. Epub 2006 Oct 26.
We develop criteria sufficient to enable detection of macroscopic coherence where there are not just two macroscopically distinct outcomes for a pointer measurement, but rather a spread of outcomes over a macroscopic range. The criteria provide a means to distinguish a macroscopic quantum description from a microscopic one based on mixtures of microscopic superpositions of pointer-measurement eigenstates. The criteria are applied to Gaussian-squeezed and spin-entangled states.
我们制定了一些充分的标准，以便在指针测量的结果并非只有两个宏观上不同的结果，而是在宏观范围内有一系列结果的情况下，能够检测到宏观相干性。这些标准提供了一种方法，可基于指针测量本征态的微观叠加混合，将宏观量子描述与微观量子描述区分开来。这些标准被应用于高斯压缩态和自旋纠缠态。
