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Submit Date Name Organisation Statement of capabilities/facilities
2020-07-02. Paolo Savio Fondazione LINKS LINKS Foundation has been created in 2016 by the fusion of two reasearch institutes, ISMB (operating on ICT ) and SITI; it has been founded by Politecnico di Torino and Compagnia di San Paolo.
LINKS, together with Politecnico di Torino, operates PhotonLab, a 250 square meters shared laboratory that includes an optical system and network experiment area, plus, an electronics lab, a machine shop and a dark room.
The laboratory has access to dark optical fiber links installed in the whole city of Torino.
Starting from real time signal processing for optical communications, the Photonics and Wireless Services research area has acquired a strong experience with FPGA design and A/D D/A systems;
such experience has already been applied to optical metrology in a recent collaboration with INRIM, developing a digital system for the low-noise detection of optical beatnotes (see eg Clivati et al. https://doi.org/10.1364/OE.378602 )
2020-07-01. Marcin Bober Nicolaus Copernicus University in Torun Nicolaus Copernicus University (UMK) operates two passive strontium lattice optical clocks with one clock laser and several optical frequency combs. Two ultra-stable cavities with crystalline mirrors and an active optical clock are under construction. The new ultra-stable lasers will be part of a global fibre link network in Poland. UMK is already connected by dedicated fibre time-transfer links to UTC(AOS), UTC(PL), and to a VLBI station. Significant part of research is focused on applying new frequency standards to study fundamental physics problems, in particular variations of effective fine structure constant and gravitational waves observations in the milihertz range.
2020-06-30. Clement Lacroute FEMTO-ST FEMTO-ST Institute is a laboratory of 700 people with scientific activities ranging from energy production and management to microsystems including research in optics, automatism, IT and time and frequency.
The latter develops ultra-low noise cryogenic sapphire oscillators, CPT based stabilized oscillator (standard and MEMS cells), two cavity based ultra-stable lasers, Yb+ ion frequency standards and superradiant laser. The first ultra-stable laser is based on ultra-compact cavity (about a liter including the vacuum chamber) and the second one is a cryogenic silicon cavity. A third cavity (room temperature) is currently used as operational reference for experiments.
Two optical frequency combs (menlo-systems) are used for frequency comparison between optical references, microwave oscillators and H-masers. An ultra-stable optical link connects the laboratory to SYRTE and PTB (in Strasbourg) that allow direct frequency comparison.
2020-06-29. Jacques MILLO FEMTO-ST FEMTO-ST Institut is a laboratory of 700 people with scientific activities ranging from energy production and management to microsystems including research in optics, automatism, IT and time and frequency.
The latter develops ultra-low noise cryogenic sapphire oscillators, CPT based stabilized oscillator (standard and MEMS cells), two cavity based ultra-stable lasers, Yb+ ion frequency standards and superradiant laser. The first ultra-stable laser is based on ultra-compact cavity (about a liter including the vacuum chamber) and the second one is a cryogenic silicon cavity. A third cavity (room temperature) is currently used as operational reference for experiments.
Two optical frequency combs (menlo-systems) are used for frequency comparison between optical references, microwave oscillators and H-masers. An ultra-stable optical link connects the laboratory to SYRTE and PTB (in Strasbourg) that allow direct frequency comparison.
2020-06-29. Bess Fang LNE-SYRTE SYRTE is the french NMI.
2020-06-26. Cecilia Clivati INRIM INRIM is the Italian NMI. It operates an Yb lattice clock with an ultrastable laser at 1156 nm, and a Sr lattice clock based on a clock laser at 1396 nm, as well as a Cs fountain and several H-masers.
INRIM is connected to SYRTE and other European NMIs through a coherent optical fiber link based on the dissemination of a narrow-linewidth telecom laser (1542 nm). The fiber backbone extends to several research institutions in Italy, including high-resolution atom and molecular spectroscopy laboratories, radiotelescopes, geodetic facilities.
We have two Er:doped frequency combs with visible extensions which we operate for high-accuracy local (Sr/Yb, Yb/Cs) and remote (Yb/1542 nm) clocks comparisons, also within other EMPIR projects ROCET, TIFOON.
We also have expertise in digital electronics for low-noise optical phase detection which has been applied so far to coherent phase transfer over fiber and optical phase locks.
2020-06-26. Thomas Fordell VTT The National Metrology Institute VTT MIKES is part of VTT Technical Research Centre of Finland Ltd.
At VTT MIKES we are working on a Sr+ single-ion clock that uses a stationary 30-cm room-temperature cavity at 674nm. A smaller transportable cavity at 1348nm is under construction. We have three frequency combs, a home-made 1GHz Ti:Sa, a 100MHz MenloSystems and a (new) 200MHz Toptica, but only the Toptica can be phase locked to an optical reference. We also have a fiber link to the nearby Metsähovi fundamental geodetic research station (fiber length is 50km). At Metsähovi there is, e.g., a satellite laser ranging system and a VGOS2010 compatible VLBI radio telescope. At VTT there is also several cryostats, one of which is equipped with optical fibers, should that be of interest to this consortium..
2020-06-26. Stefan Kröll Lund University The Quantum Information Group at the Dept of Physics, Lund University have the equipment, means and experience to investigate how the frequency sensitivity to length fluctuations of a cavity can be reduced by several orders of magnitude by using cavity materials where the group velocity of light is reduced by several orders of magnitude.
2020-06-24. Michał Zawada Nicolaus Copernicus University in Toruń Nicolaus Copernicus University (UMK) operates two passive strontium lattice optical clocks with one clock laser and several optical frequency combs. Two ultra-stable cavities with crystalline mirrors and an active optical clock are under construction. The new ultra-stable lasers will be part of a global fibre link network in Poland. UMK is already connected by dedicated fibre time-transfer links to UTC(AOS), UTC(PL), and to a VLBI station. Significant part of research is focused on applying new frequency standards to study fundamental physics problems, in particular variations of effective fine structure constant and gravitational waves observations in the milihertz range.
2020-06-17. Rodolphe Le Targat LNE-SYRTE LNE-SYRTE has a unique expertise in various aspects of frequency metrology including: ultra-stable lasers, optical frequency combs, cryogenic oscillators and atomic clocks (EMPIR projects ITOC, OC18 and ROCIT). The lab currently operates 2 strontium lattice clocks (uncertainty 1-2×10-17), a mercury lattice clock (uncertainty 5×10-17), 3 microwave fountains (accuracy down to 2.1×10-16) and several prototypes of compact clocks based on atomic references. Our institute has also pioneered quantum engineering of clock cycles based on non-destructive detection of atomic states to improve stabilities. Finally, the team plays a central role in the European optical fiber link network to disseminate an ultrastable carrier referenced to the atomic clocks of lab (EMPIR projects OFTEN, ROCIT and TIFOON). Connections to PTB (2015) and NPL (2016) have led to intercontinental all-optical comparisons of optical clocks with record stabilities, and the connection LNE-SYRTE to INRIM is now established.
2020-06-16. Uwe Sterr PTB PTB is the national metrology institute of Germany with ultrastable lasers, optical clocks and a full range of frequency metrology.
2020-06-12. Paul-Eric Pottie SYRTE (OP/PSL.SU/CNRS) SYRTE is the french NMI.

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