Chapter 1 Introduction
1.
1.1. Quantum teleportation
1.2. Connection of two quantum nodes 1.3. Connection of multiple quantum nodes
1.4. Physical realization of quantum network
1.5. Current state of the art for quantum networks 1.6. Thesis structure
Chapter 2 Interaction of single photons and atomic ensembles
2.
2.1. Photon-atom interaction: classical description
2.2. Cavity-enhanced photon-atom interaction: quantum description 2.3. Brief summary
Chapter 3 Preparation of cold atomic ensembles
3.
3.1. Vacuum
3.2. Lasers 3.3. Magnetic field
3.4. Magnetic optical trap
3.5. Polarization gradient cooling 3.6. Cold atomic optical depth and temperature
3.7. Further cooling of cold atoms
3.8. Brief summary Chapter 4 Highly retrieved quantum memory
4.
4.1. Backgroud
4.2. Principle of DLCZ-type quantum memory 4.3. DLCZ-type quantum memory in free space
4.4. DLCZ-type quanutm memory in a ring cavity
4.5. Quantum memories with atomic initial state
4.6. Brief summary
Chapter 5 Entanglement of three cold atomic ensembles
5.
5.1. Background
5.2. Entanglement between single photons and cold atomic ensembles 5.3. Entagnlement between two cold atomic ensembles
5.4. Hybrid entanglement of three single photons and three cold atomic ensembles
5.5. Entanglement of three cold atomic ensembles
5.6. Efficiency of entanglement generaction and verification 5.7. Brief summary
Chapter 6 Time-resolved interference of three frequency distinguished single photons
6.
6.1. Backg
