lazybird said:A classical, phase-coherent state is a superposition of many different Fock states (or number states). Now, due to the presence of atom-atom interaction in the condensates, each Fock state has different phase evolution rate. Therefore, a superposition state will have a spread of evolution rates, leading to ‘‘phase diffusion’’.
Phase diffusion is a process in which a substance transitions from one phase to another, such as from solid to liquid or liquid to gas. This can occur due to changes in temperature or pressure, and involves the rearrangement of molecules within the substance.
Phase diffusion is different from other phase transitions, such as melting or boiling, because it involves a gradual change from one phase to another rather than an abrupt change. It also does not involve the addition or removal of heat from the substance.
Phase diffusion can be affected by several factors, including temperature, pressure, and the properties of the substance itself. The rate of phase diffusion can also be influenced by the presence of impurities or the addition of other substances.
Some examples of phase diffusion include the gradual melting of a solid as it is heated, the slow evaporation of a liquid at room temperature, and the sublimation of dry ice (solid carbon dioxide) into a gas. Phase diffusion can also occur in chemical reactions, as different substances form and change phases.
Phase diffusion can be studied and measured using a variety of techniques, including microscopy, thermal analysis, and spectroscopy. These methods allow scientists to observe the changes in molecular structure and properties as a substance undergoes phase diffusion.