Phaseonium is a medium where the quantum atomic phase is held fixed for long times compared with various relaxation processes.
这玩意儿国内貌似没人搞，似乎好像没有相应的中文翻译，不过看样子很像跟 “玻色-爱因斯坦凝聚”有点关系样。
In recent years reports on very interesting media showing unusual optical properties have appeared in literature on atomic physics. The source of these properties is quantum interference revealed in the process of interaction of atoms with coherent light. The basis of this process is the fact that if there are at least two possibilities of realization of the process of absorption or emission of light in a given medium leading to the same final state, they interfere with each other. The result of the interference depends on relative phases of the interfering processes. However, for the interference to be observable the above phases must be well determined. The phase coherence of the medium is thus a condition necessary for obtaining the optical properties characteristic of quantum interference. This fact has been underlined by the name phaseonium given to these media by Marlan O. Scully. Recently observed unusual optical properties of a phase-coherent atomic medium (phaseonium) is explained using very simple models.
