Daniele Nicolodi

TL;DR: The first results of the LISA Pathfinder in-flight experiment demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density.

TL;DR: Local optical clock measurements that surpass the current ability to account for the gravitational distortion of space-time across the surface of Earth are demonstrated and improved techniques allow the measurement of a frequency difference with an uncertainty of the order of 10–19 between two independent optical lattice clocks, suggesting that they may be able to improve state-of-the-art geodetic techniques.

TL;DR: The capability of performing high resolution international clock comparisons paves the way for a redefinition of the unit of time and an all-optical dissemination of the SI-second.

TL;DR: In this paper, a zero-dead-time optical clock based on interleaved interrogation of two cold-atom ensembles has been proposed to overcome the Dick effect, which results in an aliasing of frequency noise from the laser interrogating the atomic transition.

TL;DR: In this paper, two independent ytterbium optical lattice clocks were used to demonstrate unprecedented levels in three fundamental benchmarks of clock performance: systematic uncertainty of $1.4, measurement instability of $3.2, and reproducibility characterised by ten blinded frequency comparisons, yielding a frequency difference of $[-7 \pm (5)stat} \pm(8)_{sys}] \times 10^{-19}