Offset-locking-based frequency stabilization of external cavity diode lasers for long-distance quantum communication. (10th November 2021)

• Record Type: Journal Article
• Authors: Miyashita, Takuto; Kondo, Takeshi; Ikeda, Kohei; Yoshii, Kazumichi; Hong, Feng-Lei; Horikiri, Tomoyuki
• Is Part Of: Japanese journal of applied physics. Volume 60:Number 12(2021)
• Publication Date: 2021-11-10
• Subjects: quantum optics -- quantum communication -- frequency stabilization; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/ac2e67
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Quantum repeaters are required for long-distance quantum communication. For efficient coupling of quantum entangled photon sources with narrow-linewidth quantum memories, we performed the frequency stabilization of two lasers at 1514 and 1010 nm. The 1514 nm pump laser of the entangled photon source exhibited a frequency stability of 3.6 × 10 –12 ( τ = 1 s). The 1010 nm pump laser of the wavelength conversion system exhibited a frequency stability of 3.4 × 10 –12 ( τ = 1 s). The stabilities of both lasers were approximately two orders of magnitude smaller than the frequency width of 4 MHz of the Pr:YSO quantum memory. Such frequency-stabilized lasers can realize the remote coupling of a quantum memory and an entangled photon source in quantum repeaters.