International Conference on Precision Physics of Simple Atomic Systems

Session

Session 14

21 May 2026, 11:00

Festsaal, Theatersaal (home symbols on map linked below) (ÖAW)

Conveners

Session 14

• Thomas Udem (Max-Planck-Institut für Quantenoptik, Garching, Germany.)

46. An optical lattice clock with a bosonic isotope of mercury

Ashley Béguin (CNRS-LTE)

21/05/2026, 11:00

1

Talk

Since 1967, time has been defined through atomic transition frequencies, establishing atomic clocks as fundamental tools for science and technology. More recently, optical atomic clocks have surpassed historical atomic microwave clocks, reaching uncertainties close to 10⁻¹⁸ and enabling both applied and fundamental investigations. At this level of performance, atomic clocks serve as sensitive...

72. Toward XUV frequency comb spectroscopy of the 1s–2s transition in He⁺

Jorge Moreno (Max Planck Institute of Quantum Optics)

21/05/2026, 11:30

1

Talk

The precise measurement of the 1s–2s transition in hydrogen serves as a cornerstone for testing quantum electrodynamics (QED) in simple atomic systems [1]. Extending such measurements to other hydrogen-like systems such as He$^+$ probes higher-order QED corrections scaling with the atomic number $Z$ and reveals nuclear structure contributions beyond hydrogen. Despite its scientific interest,...

48. Towards a network of 43Ca+ optical clocks for entanglement-enhanced metrology

Ayush Agrawal (University of Oxford)

21/05/2026, 12:00

1

Talk

Over the past few decades, advancements in optical atomic clocks have enabled measurements of time and frequency with unprecedented stability and systematic uncertainty [1,2]. Precision frequency comparisons between macroscopically separated clocks have applications in geodesy [3], probing variations in fundamental constants, and in dark matter searches [4]. Frequency comparisons between...