Broad Bandwidth and High Dimensional Quantum Memory Based on Atomic Ensembles

Description

This thesis presents an experimental study of quantum memory based on cold atomic ensembles and discusses photonic entanglement. It mainly focuses on experimental research on storing orbital angular momentum, and introduces readers to methods for storing a single photon carried by an image or an entanglement of spatial modes. The thesis also discusses the storage of photonic entanglement using the Raman scheme as a step toward implementing high-bandwidth quantum memory. The storage of photonic entanglement is central to achieving long-distance quantum communication based on quantum repeaters and scalable linear optical quantum computation. Addressing this key issue, the findings presented in the thesis are very promising with regard to future high-speed and high-capacity quantum communications. Front Matter ....Pages i-xxii Introduction (Dong-Sheng Ding)....Pages 1-16 Quantum Memory of Photonic Image and Its’ Superposition (Dong-Sheng Ding)....Pages 17-39 Storing High-Dimensional Quantum States in a Cold Atomic Ensemble (Dong-Sheng Ding)....Pages 41-54 Quantum Storage of 2-D OAM Entanglement in an Atomic Ensemble (Dong-Sheng Ding)....Pages 55-71 Quantum Storage of High-D OAM Entanglement in an Atomic Ensemble (Dong-Sheng Ding)....Pages 73-89 Raman Quantum Memory of Photonic Polarized Entanglement (Dong-Sheng Ding)....Pages 91-107 Back Matter ....Pages 109-122