Testing Fundamental Physics with Highly Charged Ion Clocks

Project Information

FunClocks

Grant agreement ID: 101019987

DOI

10.3030/101019987

EC signature date 20 June 2021

Start date 1 January 2022

End date 31 December 2026

Funded under

• EXCELLENT SCIENCE - European Research Council (ERC)

Total cost

€ 2 445 950,00

EU contribution

€ 2 445 950,00

Coordinated by

PHYSIKALISCH-TECHNISCHE BUNDESANSTALT
Germany

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Publications

Peer reviewed articles (16)

"High-stability optical clock based on a continuously ground-state cooled <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML""> <mml:msup> <mml:mrow> <mml:mi>Al</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msup> </"

Author(s): Fabian Dawel, Lennart Pelzer, Kai Dietze, Johannes Kramer, Marek Hild, Steven A. King, Nicolas C. H. Spethmann, Joshua Klose, Kilian Stahl, Sören Dörscher, Erik Benkler, Christian Lisdat, Sergey G. Porsev, Marianna S. Safronova, Piet O. Schmidt
Published in: Physical Review Research, Issue 8, 2026, Page(s) 023327, ISSN 2643-1564
Publisher: American Physical Society (APS)
DOI: 10.1103/48zr-2t1p

Line search by quantum logic spectroscopy enhanced with squeezing and statistical tests

Author(s): Ivan Vybornyi, Shuying Chen, Lukas J. Spieß, Piet O. Schmidt, Klemens Hammerer
Published in: Physical Review A, Issue 113, 2026, Page(s) 042613, ISSN 2469-9926
Publisher: American Physical Society (APS)
DOI: 10.1103/gths-s15w

Deterministic preparation of a dual-species two-ion crystal

Author(s): Maximilian J. Zawierucha, Till Rehmert, Jonas Keller, Tanja E. Mehlstäubler, Piet O. Schmidt, Fabian Wolf
Published in: Physical Review A, Issue 110, 2024, Page(s) 013107, ISSN 2469-9934
Publisher: American Physical Society
DOI: 10.1103/physreva.110.013107

Identification of highly forbidden optical transitions in highly charged ions

Author(s): Shuying Chen, Lukas J. Spieß, Alexander Wilzewski, Malte Wehrheim, Kai Dietze, Ivan Vybornyi, Klemens Hammerer, José R. Crespo López-Urrutia, Piet O. Schmidt
Published in: Physical Review Applied, Issue 22, 2024, Page(s) 054059, ISSN 2331-7019
Publisher: American Physical Society (APS)
DOI: 10.1103/physrevapplied.22.054059

Sympathetically cooled highly charged ions in a radio-frequency trap with superconducting magnetic shielding

Author(s): E. A. Dijck, C. Warnecke, M. Wehrheim, R. B. Henninger, J. Eff, K. Georgiou, A. Graf, S. Kokh, L. P. Kozhiparambil Sajith, C. Mayo, V. M. Schäfer, C. Volk, P. O. Schmidt, T. Pfeifer, and J. R. Crespo López-Urrutia
Published in: Review of Scientific Instruments, Issue 94, 2023, Page(s) 083203, ISSN 0034-6748
Publisher: American Institute of Physics
DOI: 10.1063/5.0160537

Narrow and Ultranarrow Transitions in Highly Charged Xe Ions as Probes of Fifth Forces

Author(s): Nils-Holger Rehbehn; Michael K. Rosner; Julian C. Berengut; Piet O. Schmidt; Thomas Pfeifer; Ming Feng Gu; José R. Crespo López-Urrutia
Published in: Phys. Rev. Lett., Issue 131, 2023, Page(s) 161803, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/physrevlett.131.161803

"Landé <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""> <mml:mi>g</mml:mi> </mml:math> Factor Measurement of <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""> <mml:msup> <mml:mrow/>"

Author(s): Till Rehmert, Maximilian J. Zawierucha, Sergey G. Porsev, Kai Dietze, Piet O. Schmidt, Dmytro Filin, Charles Cheung, Marianna S. Safronova, Fabian Wolf
Published in: Physical Review Letters, Issue 136, 2026, Page(s) 083203, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/1x4h-5ycp

Coherent photo-thermal noise cancellation in a dual-wavelength optical cavity for narrow-linewidth laser frequency stabilisation

Author(s): Fabian Dawel; Alexander Wilzewski; Sofia Herbers; Lennart Pelzer; Johannes Kramer; Marek B. Hild; Kai Dietze; Ludwig Krinner; Nicolas C. H. Spethmann; Piet O. Schmidt
Published in: Optics Express, Issue 32, 2024, Page(s) 7276, ISSN 1094-4087
Publisher: Optical Society of America
DOI: 10.1364/oe.516433

Low phase noise cavity transmission self-injection locked diode laser system for atomic physics experiments

Author(s): Krinner, Ludwig; Dietze, Kai; Pelzer, Lennart; Spethmann, Nicolas; Schmidt, Piet O.
Published in: Optics Express, Issue 32, 2024, Page(s) 15912-15922, ISSN 1094-4087
Publisher: Optical Society of America
DOI: 10.1364/oe.514247

Entanglement-Enhanced Optical Ion Clock

Author(s): Kai Dietze, Lennart Pelzer, Ludwig Krinner, Fabian Dawel, Johannes Kramer, Nicolas C. H. Spethmann, Timm Kielinski, Klemens Hammerer, Kilian Stahl, Joshua Klose, Sören Dörscher, Christian Lisdat, Erik Benkler, Piet O. Schmidt
Published in: Physical Review Letters, Issue 136, 2026, Page(s) 073601, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/dyqm-k8p6

"Coulomb crystallization of xenon highly charged ions in a laser-cooled <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML""> <mml:msup> <mml:mrow> <mml:mi>Ca</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msup> </mm"

Author(s): Leonid Prokhorov, Aaron A. Smith, Mingyao Xu, Kostas Georgiou, Vera Guarrera, Lakshmi P. Kozhiparambil Sajith, Elwin A. Dijck, Christian Warnecke, Malte Wehrheim, Alexander Wilzewski, Laura Blackburn, Matthias Keller, Vincent Boyer, Thomas Pfeifer, Ullrich Schwanke, Cigdem Issever, Steven Worm, Piet O. Schmidt, José R. Crespo López-Urrutia, Giovanni Barontini
Published in: Physical Review A, Issue 113, 2026, Page(s) L041102, ISSN 2469-9926
Publisher: American Physical Society (APS)
DOI: 10.1103/lxr8-l7wq

Quantum Logic Control of a Transition Metal Ion

Author(s): Till Rehmert, Maximilian J. Zawierucha, Kai Dietze, Piet O. Schmidt, Fabian Wolf
Published in: Physical Review Letters, Issue 134, 2025, Page(s) 113201, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/physrevlett.134.113201

Nonlinear Calcium King Plot Constrains New Bosons and Nuclear Properties

Author(s): Alexander Wilzewski, Lukas J. Spieß, Malte Wehrheim, Shuying Chen, Steven A. King, Peter Micke, Melina Filzinger, Martin R. Steinel, Nils Huntemann, Erik Benkler, Piet O. Schmidt, Luca I. Huber, Jeremy Flannery, Roland Matt, Martin Stadler, Robin Oswald, Fabian Schmid, Daniel Kienzler, Jonathan Home, Diana P. L. Aude Craik, Menno Door, Sergey Eliseev, Pavel Filianin, Jost Herkenhoff, Kathrin Kr
Published in: Physical Review Letters, Issue 134, 2025, Page(s) 233002, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/physrevlett.134.233002

An optical atomic clock based on a highly charged ion

Author(s): S. A. King, L. J. Spieß, P. Micke, A. Wilzewski, T. Leopold, E. Benkler, R. Lange, N. Huntemann, A. Surzhykov, V. A. Yerokhin, J. R. Crespo López-Urrutia, P. O. Schmidt
Published in: Nature, Issue 611, 2022, Page(s) 43-47, ISSN 1476-4687
Publisher: Nature Publishing Group
DOI: 10.1038/s41586-022-05245-4

"Excited-State Magnetic Properties of Carbon-like <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""> <mml:mrow> <mml:msup> <mml:mrow> <mml:mi>Ca</mml:mi> </mml:mrow> <mml:mrow>"

Author(s): Lukas J. Spieß, Shuying Chen, Alexander Wilzewski, Malte Wehrheim, Jan Gilles, Andrey Surzhykov, Erik Benkler, Melina Filzinger, Martin Steinel, Nils Huntemann, Charles Cheung, Sergey G. Porsev, Andrey I. Bondarev, Marianna S. Safronova, José R. Crespo López-Urrutia, Piet O. Schmidt
Published in: Physical Review Letters, Issue 135, 2025, Page(s) 043002, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/p88p-brnx

"Finding the Ultranarrow <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""> <mml:msub> <mml:mrow> <mml:mmultiscripts> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mpresc"

Author(s): Charles Cheung, Sergey G. Porsev, Dmytro Filin, Marianna S. Safronova, Malte Wehrheim, Lukas J. Spieß, Shuying Chen, Alexander Wilzewski, José R. Crespo López-Urrutia, Piet O. Schmidt
Published in: Physical Review Letters, Issue 135, 2026, Page(s) 093002, ISSN 0031-9007
Publisher: American Physical Society
DOI: 10.1103/flwf-c2m1