Frequency stabilisation of lasers to optical reference cavities is an
established method to achieve state-of-the-art stability. The strengths of this
method are the high discriminator coefficient of optical cavities, and the
low-noise extraction of the stabilisation signal using modulation techniques.
In this Letter we report beyond state-of-the-art performance on both of these
fundamentals, unlocking $10^{-19}$ fractional frequency laser stabilisation. We
employ a 68 cm long cavity to realise an optical storage time of 300
microseconds, achieving ultrahigh frequency discrimination. We develop a simple
and robust scheme to actively cancel residual amplitude modulation (RAM) at the
$10^{-7}$ level in an annealed-proton-exchanged lithium-niobate waveguide
electro-optic-modulator (EOM).

Este artículo explora los viajes en el tiempo y sus implicaciones.

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