Photonic Integrated Quantum Memory in Rare-Earth Doped Solids

Zong-Quan Zhou, Chao Liu, Chuan-Feng Li*, Guang-Can Guo, Daniel Oblak*, Mi Lei, Andrei Faraon*, Margherita Mazzera*, Hugues de Riedmatten*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

5 Citations (Scopus)


An optical quantum memory is a device that can store photonic quantum information and release it after a controlled time. It is an essential component for overcoming channel losses in large-scale quantum networks. Optical quantum memories have been demonstrated with various physical systems including atomic gases, single atoms in optical cavities, and rare-earth-ion doped solids. Now, quantum memories are marching toward miniaturization and integration for large-scale practical applications. Solid state systems stand as a natural choice due to the physical stability and ease of micro or nano fabrication using well-established techniques. In the past decade, considerable efforts have been devoted to developing photonic integrated quantum memories, that is, quantum memories based on micro/nano-photonic structures manufactured in solids. Remarkable performances have been achieved with integrated quantum memories, with the advantages of lower laser/electric power requirements, small volumes, large storage densities, and easy implementations. In this article, the basic concepts of optical quantum memories, the state-of-the-art technologies for fabricating integrated quantum memories in rare-earth ions doped crystals, and recent advances are introduced, and the roadmap for developing practically useful devices for applications in quantum networks is discussed.

Original languageEnglish
Article number2300257
JournalLaser and Photonics Reviews
Issue number10
Early online date23 Aug 2023
Publication statusPublished - Oct 2023


  • integrated optics
  • quantum memories
  • quantum networks
  • rare-earth ions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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