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@ARTICLE{Ulanov:639270,
      author       = {Ulanov, Alexander and Ruhnke, Bastian and Wildi, Thibault
                      and Herr, Tobias},
      title        = {{A}ttosecond-level synchronisation of chip-integrated
                      oscillators},
      reportid     = {PUBDB-2025-04371, arXiv:2510.11630},
      year         = {2025},
      note         = {8 pages, 3 figures},
      abstract     = {Attosecond science provides a window to the fastest
                      processes in chemistry, materials science, and biology.
                      Accessing this time scale requires precisely synchronised
                      oscillators. In free-electron X-ray lasers, which also
                      provide sub-atomic resolution, synchronisation must be
                      achieved across hundreds of meters. Current approaches to
                      synchronisation based on mode-locked lasers deliver this
                      level of performance but complexity, cost and size hinder
                      their deployment in facility-wide multi-node networks.Here,
                      we demonstrate attosecond-level synchronisation of two
                      chip-integrated photonic oscillators (microcombs) separated
                      by 100~m of fibre. A pair of continuous-wave lasers
                      establishes a time reference that is delivered over fibre,
                      and on-chip Kerr-nonlinear synchronisation results in an
                      integrated relative timing jitter of the microcombs below
                      400~as (1~kHz to 1~MHz), without any active stabilisation.
                      These results unlock precision timing at scale for large
                      facilities and next-generation technologies such as
                      disaggregated computing and quantum networks, and ultimately
                      may lead to chip-integrated attosecond photonics.},
      cin          = {FS-CFEL-2-UMP},
      cid          = {I:(DE-H253)FS-CFEL-2-UMP-20201209},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / VH-NG-1404 - Ultra-fast nonlinear
                      microphotonics $(2019_VH-NG-1404)$ / STARCHIP -
                      Microphotonics-based frequency combs for habitable exoplanet
                      detection (853564) / M-Engine - Microcomb Photonic Engine
                      (101137000)},
      pid          = {G:(DE-HGF)POF4-631 / $G:(DE-HGF)2019_VH-NG-1404$ /
                      G:(EU-Grant)853564 / G:(EU-Grant)101137000},
      experiment   = {EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2510.11630},
      howpublished = {arXiv:2510.11630},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2510.11630;\%\%$},
      doi          = {10.3204/PUBDB-2025-04371},
      url          = {https://bib-pubdb1.desy.de/record/639270},
}