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Logo: Sonderforschungsbereich geo-Q
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Logo: Sonderforschungsbereich geo-Q
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Transportable optical clock used to measure gravitation for the first time

During a European collaboration at the French Modane Underground Laboratory (LSM) researchers from the National Physical Laboratory (NPL), the Physikalisch-Technische Bundesanstalt (PTB) and the Istituto Nazionale di Ricerca Metrologica (INRIM) successfully used a transportable strontium optical lattice clock developed by Christian Lisdat and his team at PTB.

The researchers measured the gravity potential difference between the exact location of the clock at LSM's location in the middle of the Fréjus road tunnel between France and Italy and a second clock at INRIM, located 90 km away in Torino, Italy, at a height difference of about 1,000 m. The two measurements were shown to be consistent.

For further information about this revolutionary experiment please consult the press release at PTB

The results have been published in the recent edition of Nature Physics:
Jacopo Grotti et al.: "Geodesy and metrology with a transportable optical clock".