TY  - EJOUR
AU  - Ulanov, Alexander
AU  - Ruhnke, Bastian
AU  - Wildi, Thibault
AU  - Herr, Tobias
TI  - Attosecond-level synchronisation of chip-integrated oscillators
IS  - arXiv:2510.11630
M1  - PUBDB-2025-04371
M1  - arXiv:2510.11630
PY  - 2025
N1  - 8 pages, 3 figures
AB  - 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.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2025-04371
UR  - https://bib-pubdb1.desy.de/record/639270
ER  -