量子通信中准二维超冷费米原子体系的BCS-BEC渡越OA

As a core technology of next-generation information systems,quantum communication relies on quantum entanglement and quantum-state manipulation to achieve secure information transmission.Ultracold atomic systems,characterized by their exceptional purity and controllability,provide a unique physical platform for quantum communication.By cooling Fermi atoms to temperatures near absolute zero and employing magneto-optical traps and optical lattices to realize dimensional confinement,these systems enable precise investigations of quantum many-body phenomena and quantum-state engineering.The Bardeen-Cooper-Schrieffer-Bose-Einstein condensation(BCS-BEC)crossover offers a solid theoretical and experimental foundation for the precise manipulation of quantum states in quantum communication applications.This paper systematically reviews recent advances in Gaussian pair fluctuation theory for both three-dimensional and quasi-two-dimensional ultracold Fermi atomic systems.It introduces the theoretical models and experimental progress related to quasi-two-dimensional ultracold Fermi gases and analyzes the major challenges that remain in current research.The review provides valuable insights into quantum phase transitions and quantum-state evolution in ultracold atomic systems,while also serving as an important reference for the preparation,manipulation,and transmission of quantum states in quantum communication technologies.