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Measurements at the Limit


7 November 2019


Physikalisch-Technische Bundesanstalt (PTB)
Institute Berlin, Lecture Hall
Abbestraße 2–12
10587 Berlin


Participation in the symposium is free of charge. However, please use the registration form, as the number of places is limited. 

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The symposium “Measurements at the limit” will be held on 7th November 2019, just few months after the fundamental revision of the International System of Units, the SI, that is based on fixing the numerical values of “defining constants”, among them fundamental constants of Nature. The determination of these constants as well as testing the underlying physical laws in extremely precision experiments will be in the focus of the symposium. In particular, we aim to review recent achievements in high-accuracy measurements of energy, mass, time and length. The various applications of these measurements, ranging from the detection of gravitational waves and the search for the New Physics to the definition of SI units, will be discussed in detail. Moreover, special attention will be paid to the quantum nature of such measurements as well as to their physical limitations.


Klaus Blaum (Germany)
Karsten Danzmann (Germany)
Igor Ivanov (Portugal)
Ursula Keller (Switzerland)
Wolfgang Ketterle (USA)
Tanja Mehlstäubler (Germany)
Stephan Schlamminger (USA)
Christof Wetterich (Germany) 

Note of Thanks

The symposium is generously funded by the Wilhelm and Else Heraeus-Foundation, a private German institution which supports scientific research and education with emphasis on physics.

Preliminary program of the WE-Heraeus-Symposium

 “Measurements at the Limit”

PTB campus Berlin, November 7th 2019


9:00       Welcome speech by Joachim Ullrich; Welcome address by Stefan Jorda

9:15       High-precision mass measurements at atomic traps. Klaus Blaum

10:00     Next-generation multi-ion optical clocks, Tanja Mehlstäubler

10:45    Coffee break

11:15    High-precision measurements with ultra-cold atoms, Wolfgang Ketterle

12:00    Ultrafast laser physics, Ursula Keller

12:45    Lunch

14:15    How Planck's constant can be used to measure macroscopic mass, Stephan Schlamminger

15:00    Detection of the gravitational waves, Stefanie Kroker

15:45    Coffee break

16:15    Peeking into the microscopic world through highest energy collisions, Igor Ivanov

17:00    High-precision data about fundamental constants: What do we learn about Universe, Christof Wetterich

17:45     Discussion

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