Quantum frequency down-conversion of single photons at 1552 nm from single InAs quantum dot

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum frequency down-conversion quantum dot telecommunication band single photon
• 年，卷（期）: 2018,（9）
• 页码范围: 679-684
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/9/097802

摘要

Near-infrared single photon sources in telecommunication bands,especially at 1550 nm,are required for long-distance quantum communication.Here a down-conversion quantum interface is implemented,where the single photons emitted from single InAs quantum dot at 864 nm is down converted to 1552 nm by using a fiber-coupled periodically poled lithium niobate(PPLN)waveguide and a 1.95 μmm pump laser,and the frequency conversion efficiency is～40％.The single-photon purity of quantum dot emission is preserved during the down-conversion process,i.e.,g(2)(0),only 0.22 at 1552 nm.This present technique advances the Ⅲ-Ⅴ semiconductor quantum dots as a promising platform for long-distance quantum communication.