Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Applied Physics Express

Phase locking and absolute frequency stabilization of laser sources for a Pr:YSO quantum memory

Yohei Sugiyama, Yuga Kondo, Tomoyuki Horikiri, Daisuke Akamatsu, Feng-Lei Hong

Published Apr 30, 2024• 2 citations
Publisher

Abstract

Abstract We propose a scheme to phase lock a quantum-memory control laser, frequency-conversion pump laser, and two-photon source over three octaves in frequency to operate a quantum memory. The absolute frequencies of the laser sources are determined based on a Doppler-free iodine hyperfine transition. The achieved relative frequency instability and uncertainty were ≤1 × 10–12 and 3 × 10–11, respectively, which are below the requirement for operating a Pr:YSO quantum memory. This scheme simplifies the instrumentation of laser sources in a quantum repeater, and increases the reliability of quantum communication systems.

DOI
10.35848/1882-0786/ad45ad

Related papers

Transfer of linewidth and frequency stability from an iodine-stabilized Nd:YAG laser to a quantum memory control laser through an optical frequency comb

Takeshi Kondo, Seiho Shindo, Daisuke Yoshida +5 more

Abstract To implement quantum repeaters for long-distance quantum communications, frequency stabilization is necessary for coupling telecommunication wavelength photons with quantum memories that operate in the visible region. Here, a narrow-linewidth optical frequency comb for frequency stabilization is developed through phase-locking to an iodine-stabilized Nd:YAG laser using high-speed servo control. Subsequently, we phase lock a Pr 3+ :Y 2 SiO 5 (Pr:YSO) quantum memory control laser to the developed optical frequency comb for linewidth transfer. The obtained linewidth (3.1 kHz) and frequency stability (1.84 × 10 −12 at an average time of 0.01 s) are sufficient for multimode storage in Pr:YSO quantum memory.

Japanese Journal of Applied Physics•Jul 7, 2022•4 citations

Offset-locking-based frequency stabilization of external cavity diode lasers for long-distance quantum communication

Takuto Miyashita, Takeshi Kondo, Kohei Ikeda +3 more

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.

arXiv:2108.13130•Japanese Journal of Applied Physics•Oct 11, 2021•13 citations

Coupling of a quantum memory and telecommunication wavelength photons for high-rate entanglement distribution in quantum repeaters

Mannami, Kyoko, Kondo, Takeshi, Tsuno, Tomoki +7 more

Quantum repeaters are indispensable tools for long-distance quantum communication. However, frequency matching between entangled photon sources and remote quantum memories (QMs) is difficult, which is an obstacle to the implementation of quantum repeaters. In this paper, we demonstrate a method to achieve the coupling of a Pr:YSO as a fixed-time QM with a single telecommunication-wavelength photon through frequency stabilization using an optical frequency comb over all applied laser wavelengths. The demonstrated method can lead to the implementation of a quantum repeater scheme enabling an improvement of the entanglement generation rate, paving the way for long-distance quantum communication. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

•Dec 6, 2021•0 citations

Development of a frequency-stabilized pump source at 436 nm for 606 nm–1.5 µm entangled photon pair generation

Rina Takeda, Shinnosuke Aoyama, Kyosuke Sato +3 more

We developed a frequency-stable laser light source operating at 436 nm to produce entangled photon pairs at 606 nm and 1.5 µm via spontaneous parametric down conversion. This light source was produced via the sum frequency generation of two lasers operating at 852 and 895 nm, each stabilized to the D2 and D1 transitions of cesium atoms, respectively. We evaluated the frequency stability of the light source using heterodyne measurements between two identical setups. The developed light source can be used to generate frequency-stable photon pairs, a critical requirement for quantum repeaters using Pr:YSO quantum memories.

Applied Optics•Sep 3, 2025•0 citations

Coupling of a quantum memory and telecommunication wavelength photons for high-rate entanglement distribution in quantum repeaters

Kyoko Mannami, Takeshi Kondo, Tomoki Tsuno +7 more

Quantum repeaters are indispensable tools for long-distance quantum communication. However, frequency matching between entangled photon sources and remote quantum memories (QMs) is difficult, which is an obstacle to the implementation of quantum repeaters. In this paper, we demonstrate a method to achieve the coupling of a Pr:YSO as a fixed-time QM with a single telecommunication-wavelength photon through frequency stabilization using an optical frequency comb over all applied laser wavelengths. The demonstrated method can lead to the implementation of a quantum repeater scheme enabling an improvement of the entanglement generation rate, paving the way for long-distance quantum communication.

arXiv:2112.01057•Optics Express•Nov 19, 2021•14 citations

Compact frequency-stabilized pump laser for wavelength conversion in long-distance quantum communication

Kohei Ikeda, Yusuke Hisai, Kazumichi Yoshii +3 more

We demonstrate a compact frequency-stabilized laser at 1064 nm using the Doppler-free saturation absorption spectroscopy of molecular iodine. The achieved laser frequency stability and linewidth are 5.7×10−12 (corresponding to an uncertainty of the laser frequency of 1.6 kHz) and 400 kHz, respectively. The developed frequency-stabilized laser can be used as a pump laser for wavelength conversion from the visible to telecom (or vice versa) to connect quantum memories utilizing nitrogen-vacancy centers in diamond at remote nodes in fiber-based quantum communication.

arXiv:1807.03472•Journal of the Optical Society of America B•Jul 30, 2018•3 citations
Abstract We propose a scheme to phase lock a quantum-memory control laser, frequency-conversion pump laser, and two-photon source over three octaves in frequency to operate a quantum memory. The absolute frequencies of the laser sources are determined based on a Doppler-free iodine hyperfine transition. The achieved relative frequency instability and uncertainty were ≤1 × 10–12 and 3 × 10–11, respectively, which are below the requirement for operating a Pr:YSO quantum memory. This scheme simplifies the instrumentation of laser sources in a quantum repeater, and increases the reliability of quantum communication systems.
Abstract To implement quantum repeaters for long-distance quantum communications, frequency stabilization is necessary for coupling telecommunication wavelength photons with quantum memories that operate in the visible region. Here, a narrow-linewidth optical frequency comb for frequency stabilization is developed through phase-locking to an iodine-stabilized Nd:YAG laser using high-speed servo control. Subsequently, we phase lock a Pr 3+ :Y 2 SiO 5 (Pr:YSO) quantum memory control laser to the developed optical frequency comb for linewidth transfer. The obtained linewidth (3.1 kHz) and frequency stability (1.84 × 10 −12 at an average time of 0.01 s) are sufficient for multimode storage in Pr:YSO quantum memory.
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.
Quantum repeaters are indispensable tools for long-distance quantum communication. However, frequency matching between entangled photon sources and remote quantum memories (QMs) is difficult, which is an obstacle to the implementation of quantum repeaters. In this paper, we demonstrate a method to achieve the coupling of a Pr:YSO as a fixed-time QM with a single telecommunication-wavelength photon through frequency stabilization using an optical frequency comb over all applied laser wavelengths. The demonstrated method can lead to the implementation of a quantum repeater scheme enabling an improvement of the entanglement generation rate, paving the way for long-distance quantum communication. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
We developed a frequency-stable laser light source operating at 436 nm to produce entangled photon pairs at 606 nm and 1.5 µm via spontaneous parametric down conversion. This light source was produced via the sum frequency generation of two lasers operating at 852 and 895 nm, each stabilized to the D2 and D1 transitions of cesium atoms, respectively. We evaluated the frequency stability of the light source using heterodyne measurements between two identical setups. The developed light source can be used to generate frequency-stable photon pairs, a critical requirement for quantum repeaters using Pr:YSO quantum memories.
Quantum repeaters are indispensable tools for long-distance quantum communication. However, frequency matching between entangled photon sources and remote quantum memories (QMs) is difficult, which is an obstacle to the implementation of quantum repeaters. In this paper, we demonstrate a method to achieve the coupling of a Pr:YSO as a fixed-time QM with a single telecommunication-wavelength photon through frequency stabilization using an optical frequency comb over all applied laser wavelengths. The demonstrated method can lead to the implementation of a quantum repeater scheme enabling an improvement of the entanglement generation rate, paving the way for long-distance quantum communication.
We demonstrate a compact frequency-stabilized laser at 1064 nm using the Doppler-free saturation absorption spectroscopy of molecular iodine. The achieved laser frequency stability and linewidth are 5.7×10−12 (corresponding to an uncertainty of the laser frequency of 1.6 kHz) and 400 kHz, respectively. The developed frequency-stabilized laser can be used as a pump laser for wavelength conversion from the visible to telecom (or vice versa) to connect quantum memories utilizing nitrogen-vacancy centers in diamond at remote nodes in fiber-based quantum communication.