Continuous Variable Entanglement Distribution for Long-Distance Quantum Communication

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（6）
• 页码范围: 13-16
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/6/060302

摘要

We develop a frequency-tunable two-color continuous variable entangled state and demonstrate the entanglement distribution over a telecom single mode fiber.One beam of the entangled state (795nm) can be continuously tuned over a range of 2.4 GHz and the hyperfine transitions of a rubidium D1 line are measured based on saturated absorption spectroscopy.The other beam (1560nm) is injected into a 5-km single mode fiber to distribute the entanglement,and the entanglement evolution between the transmitted beam and its entangled counterpart is investigated.The system presented here will find potential applications in long-distance quantum information processing.