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Q: Fachverband Quantenoptik und Photonik
Q 17: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
Q 17.7: Vortrag
Montag, 10. März 2025, 18:45–19:00, HS PC
Fiber-Based Phase Noise Cancellation for Links in Networks of Optical Clocks — •Jonas Kankel1,2, Luis Hellmich1,2, Steven Worm1,2, Ullrich Schwanke2, Lakshmi Kozhiparambil1,3, Yang Yang1,3, and Cigdem Issever1,2 — 1DESY (Deutsches Elektronen-Synchrotron), Zeuthen, Germany — 2Platanenallee 6 — 3Max-Planck-Institut für Kernphysik Heidelberg, Germany
Modern optical atomic clocks, with fractional uncertainties on the order of 10−19, enable the exploration of fundamental physics, such as the temporal variation of fundamental constants and constraints on dark matter models. The fine-structure constant α, predicted to vary in many theories of new physics, can be probed using atomic clocks due to the sensitivity of clock transitions to changes in α.
We aim to build a highly-charged ion (HCI) clock in order to set new limits on variations of α and translate these measurements into bounds on ultra-light scalar dark matter models. Initially, we will compare our HCI clock to a local Sr-lattice clock. In anticipation of comparing clocks not only across one institute but in national or international networks, long-distance transmission of ultra-stable frequency references is required, typically through fiber optic cables. Reference signals are degraded by phase noise from environmental factors like temperature fluctuations and vibrations. We are investigating a fiber-based variant of a Michelson interferometer for active phase noise cancellation in a phase-locked loop scheme.
Keywords: Optical atomic clock; Highly-charged ion; Fiber optics; Fine-structure constant; Dark matter