One-dimensional dipole-octopole or dipole-octupole interactions

Very similar to van der Waals interactions or dipole-dipole interactions, the lowest-order multipole-multipole interactions among neutral atoms, dipole-octopole interactions are one type of higher-order interactions among neutral atoms. Some literatures use octupole, and others use octupole. In this presentation, we will use octopole. Here we consider dipole-octopole interactions among highly excited atoms or Rydberg atoms. One Rydberg atom has one ion core and one highly excited atom, or a positive and negative pole of a dipole. Therefore, a Rydberg atom can be treated as an electric dipole. Quantum mechanically, Rydberg atoms have octopole moments, so Rydberg atoms can also be treated as an octopole. Hence, Rydberg atom-atom interactions can be treated as dipole-octopole interactions. In this presentation, few-body dipole-octopole interactions will be investigated. There are many applications. For example, such interactions are essential for creating more compact quantum computers, quantum devices, and quantum electronics.