Entanglement between distant quantum memories via quantum frequency conversion

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17772
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Osaka University
• Principal Investigator: Ikuta Rikizo 大阪大学, 基礎工学研究科, 助教 (90626475)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 量子エレクトロニクス / 量子情報 / 量子通信 / 波長変換 / エンタングルメント / 量子中継 / 量子メモリ / 冷却原子

Outline of Final Research Achievements

We studied about establishment of entanglement between distant quantum memories through an optical fiber-based quantum communication. For the effective fiber-based quantum communication with quantum repeater algorithm, entanglement between a quantum memory and a telecom photon is vital. We developed a polarization-insensitive quantum frequency converter. By using the device, we converted a wavelength of a visible photon entangled with a rubidium atomic cloud as a quantum memory to the telecom wavelength. As a result, we achieved an entanglement between the atoms and the telecom photon. We performed other experiments for long distance quantum communication: demonstration of the two photon interference without timing synchronization of the photons, and faithful entanglement distribution of polarized photons via noisy optical fibers.

Free Research Field

量子情報・量子光学