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Submit Date Name Organisation Statement of capabilities/facilities
2020-08-25. KevinLiewsMW KevinLiews KevinLiews Belize
2020-07-23. Vladimir Skliarov NSC-IM Tasks and Contributions of National Scientific Centre “Institute of Metrology”, Ukraine:
Participation in simultaneous measurements performed on ensembles of many atomic absorbers for improving the frequency stability of optical clocks with single or few atoms/ions using information obtained.
The direct investigation of theoretically predicted characteristics of these transitions via the quantum-logic readout scheme with using the National measurement standard of time and frequency.
Revision of the existing standards.
Knowledge transfer.
Organizing beneficiary-oriented events (workshops, roundtables, etc.), addressed mainly to end users as public health and environment national regulators, as well as to local authorities regarding the outcomes of the project.
Well connected with various relevant stakeholders (Ukrainian, COOMET members).
2020-06-29. Sebastien Bize LNE-SYRTE several optical clocks that could be used to perform composite clock experiments. Possibliy via fiber links and between clocks with different atomic species.
2020-06-29. Sebastien Bize LNE-SYRTE several optical clocks that could be used to perform composite clock experiments. Possibliy via fiber links and between clocks with different atomic species.
2020-06-28. Giacomo Cappellini CNR-INO CNR-INO is carrying out research activity with an Ytterbium apparatus located at the Physics Department of the University of Florence. The machine works in the quantum-degenerate regime, generating samples of different Yb isotopes (bosons and fermions) trapped in 3D optical lattices at the transition magic wavelength. Single site resolution imaging with a high NA objective will also be implemented within the timespan of the project. Our system also includes a un ultranarrow laser at 578 nm locked to a ULE cavity, with the possibility to connect it to primary frequency standards located at INRIM in Turin via an optical fiber link that connects the two institutes.
2020-06-27. Giovanni Barontini University of Birmingham We are in the process of starting activities on highly-charged ion cocks. Funding have been secured to realize a clock of Cf15+. The funding decision is very recent, and currently there is a lot of uncertainty on the timing and scale of the project.
Currently we do not have capabilities or facilities in place, but elements for production and deceleration of HCIs will be developed within the timeframe of the call.
The HCI clock will be part of a larger initiative that includes national and international partners like NPL and MPI Heidelberg that are participating in this consortium.
2020-06-26. José R. Crespo López-Urrutia Max-Planck-Institut für Kernphysik -Cryogenic RF-traps for sympathetic cooling of highly charged ions (CryPTEx-i and CryPTEx-IISC. The latter has a superconducting, monolithic RF quadrupole resonator operating at 4.6 K as ultralow noise RF trap for Coulomb crystals of Be+ ions.

-Optical emission spectroscopy of highly charged ions. We explore the mostly unknown optical and UV transitions of HCI, measuring wavelengths at the ~1 ppm level. The complex spectra cannot be accurately calculated as needed for line assignment and search of clock transitions. Our work on emission spectroscopy and charge-state analysis is required by other groups (e. g., PTB) for optical clock studies.

-XUV frequency comb: We developed a 100 MHz XUV frequency comb reaching stable hour-long operation at the 35th harmonic of 1030 nm, with output powers of ~20 microwatt in the 15th one. The UHV system will be connected with the superconducting trap for direct FC spectroscopy of photoionization-insensitive highly charged ions in the XUV region.
2020-06-26. Carlo Sias INRiM INRiM is building an experimental apparatus for creating ultracold atom-ion mixtures of Li atoms and Ba+ ions. The apparatus is equipped with a laser to address the 1762nm clock transition of Ba+, a ULE cavity, a Paul trap, an in-vacuum optical cavity for optically trapping the Ba+ ions, a high-resolution imaging system for both Li and Ba+. The experimental apparatus is located at the European Laboratory for Nonlinear Spetroscopy (LENS), which is connected through fiber link to the INRiM headquarters in Turin.
2020-06-26. Carlo Sias INRiM INRiM is building an experimental apparatus for creating ultracold atom-ion mixtures of Li atoms and Ba+ ions. The apparatus is equipped with a laser to address the 1762nm clock transition of Ba+, a ULE cavity, a Paul trap, an in-vacuum optical cavity for optically trapping the Ba+ ions, a high-resolution imaging system for both Li and Ba+. The experimental apparatus is located at the European Laboratory for Nonlinear Spetroscopy (LENS), which is connected through fiber link to the INRiM headquarters in Turin.
2020-06-25. Tanja Mehlstäubler LUH We operate a dual species multi-ion In+ / Yb+ clock.
Have access to fiber network linking us to PTBs Sr lattice and Yb+/Sr+ clock
to carry out frequency comparisons as well as to cryogenic Si cavity.
A core research point is the investigation of multi-ensemble operation.
2020-06-25. Ondrej Cip Institute of Scientific Instruments of the CAS ISI is research institute, member of Czech Academy of Sciences. We have activities at fundamental metrology of time and frequency:
* Ca+ single ion and Coulomb crystals based optical clocks
* simulations and modelling of trajectories of ion/ions in the trap
* calculations and measurements of electric fields, heating rates of the trap, ion cooling methods
* operation of clock lasers disciplined by high-finesse cavities together with H-maser and optical frequency comb
* PLL control of all interrogation lasers to optical frequency comb – possible narrow-band lambda scheme excitation of Ca+ ion
* operation of phase-coherent fibre links in Central Europe (in cooperation with CESNET): ISI-BEV Vienna, ISI-CESNET Prague and ISI-CEZ Temelin
* Ca+/Al+ two species experimental setup is under construction (2021 expected put in the operation)
2020-06-24. Marcin Witkowski Nicolaus Copernicus University UMK has unique two-species MOT for simultaneous trapping of Rb and Hg atoms
which is equipped for direct probing of Rb two photons transitions together
with two extremely narrow UV-C reference transitions in Hg. Our ongoing
research activity is focused on new physics searches, e.g. based on King
linearity in Hg isotope shifts, ultra-cold molecular photoassociation
studies, and interspecies collisional effects. UMK infrastructure also
includes two Sr optical lattice clocks linked by a dedicated time-transfer
fibre links to UTC(AOS) and UTC(PL), several optical frequency combs, and
ultra-stable lasers.
2020-06-24. Marcin Witkowski Nicolaus Copernicus University UMK has unique two-species MOT for simultaneous trapping of Rb and Hg atoms
which is equipped for direct probing of Rb two photons transitions together
with two extremely narrow UV-C reference transitions in Hg. Our ongoing
research activity is focused on new physics searches, e.g. based on King
linearity in Hg isotope shifts, ultra-cold molecular photoassociation
studies, and interspecies collisional effects. UMK infrastructure also
includes two Sr optical lattice clocks linked by a dedicated time-transfer
fibre links to UTC(AOS) and UTC(PL), several optical frequency combs, and
ultra-stable lasers.
2020-06-24. Piet Schmidt Leibniz University Hannover (LUH) We can offer:
* multi-ion Ca+ clock using dynamical decoupling
* Al+/Ca+ clock with prospects of long coherence times of several seconds in Al+
* HCI quantum logic clock (Ar13+, future: Ca14+, Pd12+)
* fibre links between projects and access to Si-cavity-stabilized laser for cascaded/composite clocks
* quantum logic techniques
2020-06-23. Thomas Lindvall VTT MIKES VTT MIKES is the national metrology institute of Finland. We are operating a 88Sr+ single-ion optical clock, an ensemble of commercial atomic clocks for UTC realization, and also carry out research on time and frequency transfer.
2020-06-23. Gianluca Bertaina INRiM I am a computational physicist, expert in quantum Monte Carlo methods applied to the study of the equilibrium and spectral properties of many-body systems such as cold atomic bosons or fermions. I also have experience in semiclassical methods for the evaluation of molecular vibrational spectra and in the numerical evaluation of the inverse Laplace transform.

I typically use high performance computing facilities to perform massively parallel simulations. My languages of choice are Fortran, Mathematica and Python.
2020-06-22. Roman Ciurylo NCU
2020-06-22. Jörg Premper BEV BEV is the national metrology institute of Austria.
*Provision of different frequency standards (national Cs primary standard, H-maser, ultra stable optical frequency sources) and optical frequency combs
*Optical fiber link and dissemination of frequency reference
* Implementation of bidirectional fiber link to ISI
* currently establishing a fiber link Atominstitut-BEV
2020-06-22. Anne Curtis NPL At NPL, the UK's national metrology institute, we have the capability of a number of high-performance optical frequency standards, including Sr-lattice and single Yb+ optical clocks, as well as measurement infrastructure for absolute and optical ratio measurements of optical frequency standards, including optical frequency combs and Cs-fountain microwave standards.
2020-06-22. Thorsten Schumm TU Wien * Expertise in Thorium-229, especially solid-state approach (doped crystals) and recoil ion sources
* Preparation of sources and samples from existing stocks of U-233, Th-229 and many others, licensed nuclear facility
* VUV frequency comb construction for Th-229 nuclear spectroscopy
* Optical fiber link and dissemination of frequency reference
* Bridge between Cs primary standard and VUV wavelengths
* currently establishing a link BEV-Atominstitut
2020-06-19. Nils Huntemann Physikalisch-Technische Bundesanstalt PTB is the national metrology institute of Germany. At PTB we operate optical clocks based on trapped ions and neutral atoms confined in optical lattices.

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