Quantum information-holding single-photon router based on spontaneous emission

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2017,（9）
• 页码范围: 1-6
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11433-017-9059-3

摘要

In this paper,we propose a single-photon router via the use of a four-level atom system coupled with two one-dimensional coupled-resonator waveguides.A single photon can be directed from one quantum channel into another by atomic spontaneous emission.The coherent resonance and the photonic bound states lead to the perfect reflection appearing in the incident channel.The fidelity of the atom is related to the magnitude of the coupling strength and can reach unit when the coupling strength matches ga =gb.This shows that the transfer of a single photon into another quantum channel has no influence on the fidelity at special points.