Accuracy of a commercial cold-atom microwave clock

Luc Archambault, Cédric Majek, Bruno Desruelle +4 more

Bruno Pelle, Bruno Desruelle, Ramon Szmuk +1 more

Laser cooled atomic clocks allow to both extend spectroscopy duration and better control the systematics. We present a commercial microwave clock that achieve an extreme stability and accuracy in the 10-15range within a day, with a turnkey product dedicated for continuous long-term operation.

Dennis D. McCarthy, P. Kenneth Seidelmann

Scott A. Diddams

Luc Archambault, Floriane Sparma, L. Lorini +4 more

We present results of commercial microwave clocks developed by Exail Quantum Systems (formerly Muquans). The MuClocks are cold-atom-based turnkey products dedicated to continuous long-term operation. A frequency stability of 1×10-15 over more than a month has been demonstrated on several set-ups, competing with the frequency drift (~1×10-16/day) of the best masers. Recent stability evaluations show for the best clock a long-term frequency stability of 7×10-16 over two weeks and for the longest run ~2×10-15 over two months. IIn this contribution, we will present a preliminary accuracy budget, the targeted product accuracy being in the 5×10-15 range. Control and evaluation of the known frequency biases is on-going. Several frequency shifts have already been quantified: the Quadratic Zeeman shift, the cavity pulling including its asymmetry from nearby cavity resonances, microwave phase transients and the Ramsey pulling.

Bruno Pelle, Ramon Szmuk, Bruno Desruelle +2 more

Laser cooled atomic clocks allow to both extend spectroscopy duration and better control the systematics. We present a commercial microwave clock that achieve an extreme stability of 3.2×10-13at 1 s and 1×10-15in less than 2 days, with a turnkey product dedicated for continuous long-term operation.