18 citations · 47 across the 9 of their papers we have counts for
9 papers
Sr optical clock with systematic uncertainty and measurement of its absolute frequency with uncertainty
T. Lindvall, T. Fordell, K. J. Hanhijärvi +4
We report on a Sr single-ion optical clock with an estimated fractional systematic uncertainty of . The low uncertainty is enabled by small rf loss…
Fast optical data transfer into a Josephson junction array
K. Kohopää, J. Nissilä, E. Mykkänen +19
We employ externally shunted Nb-AlO-Nb Josephson junctions for demonstrating a circuit that is suitable for an optically driven Josephson Arbitrary Waveform Synthesizer (JAWS).…
Measurement of the Differential Static Scalar Polarizability of the Sr Clock Transition
T. Lindvall, K. J. Hanhijärvi, T. Fordell +1
We report on a precision measurement of the differential static scalar polarizability of the optical clock transition in the $^…
Coordinated international comparisons between optical clocks connected via fiber and satellite links
Thomas Lindvall, Marco Pizzocaro, Rachel M. Godun +62
Optical clocks provide ultra-precise frequency references that are vital for international metrology as well as for tests of fundamental physics. To investigate the level of agreem…
Guidelines for designs for ultrastable laser with fractional frequency instability
Joannès Barbarat, Erik Benkler, Marcin Bober +46
Lasers with long coherence time and narrow linewidth are an essential tool for quantum sensors and clocks. Ultrastable cavities and laser systems are now commercially available wit…
Closed-Loop Polarization Mode Dispersion Mitigation for Fibre-Optic Time and Frequency Transfer
Thomas Fordell, Anders E. Wallin, Thomas Lindvall +1
A polarization switching pulse interleaver is shown to be effective in reducing timing noise due to polarization mode dispersion in time and frequency transfer based on mode-locked…
In-situ electro-optic sampling of microwave signals under cryogenic conditions and for superconducting applications
Shekhar Priyadarshi, Rinis Ferizaj, Oliver Kieler +8
We demonstrate a cryogenic electro-optic sampling (EOS) setup that allows for the measurement of microwave signals at arbitrary positions on a cryogenic chip-scale device. We use a…
Driving a low critical current Josephson junction array with a mode-locked laser
J. Nissila, T. Fordell, K. Kohopaa +11
We demonstrate the operation of Josephson junction arrays (JJA) driven by optical pulses generated by a mode-locked laser and an optical time-division multiplexer. A commercial pho…
Broadband lasers for photo-ionization and repumping of trapped ions
T. Fordell, T. Lindvall
A frequency-stable, broadband laser is presented for experiments on trapped ions. Since the design is based on widely available semiconductor optical amplifier technology, similar…