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We demonstrate combined high-fidelity long-haul transfer of a linearlychirped, optical frequency and time transfer. In a proof-of-principleexperiment we transfer an optical frequency with a linear chirp of around 238kHz/s via a phase-stabilized underground fiber link of 150 km. We find afractional frequency transfer instability (Allan deviation, 18000 s averagingtime) and simultaneity of the chirped frequency between both ends on a level ofaround $2\times10^{-19}$, where the active phase stabilization suppressescumulative, symmetrical effects. In a second step, we demonstrate the remotemeasurement of synchronisation taking advantage of chirped-frequency transfer.The uncertainty of time transfer here is around 500 ps.

Chirped Frequency Transfer with an accuracy of $10^{-18}$ and its Application to the Remote Synchronisation of Timescales