CoQuS Colloquium - Eugene S. Polzik


On Monday, 23 April 2018, Eugene S. Polzik (Niels Bohr Institute, University of Copenhagen) will speak about "Tracking motion beyond the uncertainty limits"

CoQuS Seminar Talk

Eugene S. Polzik

Niels Bohr Institute, University of Copenhagen


"Tracking motion beyond the uncertainty limits"


Quantum mechanics dictates that a continuous measurement of the position of an object imposes a random quantum back action (QBA) perturbation on its momentum. This randomness translates with time into position uncertainty, thus leading to the well known uncertainty on the measurement of motion. As a consequence, and in accordance with the Heisenberg uncertainty principle, the QBA puts a limitation—the so-called standard quantum limit—on the precision of sensing of position, velocity and acceleration. In this talk I will present the ideas [1] and experimental results [2] for measurement of motion of a mechanical oscillator with the precision not restricted by the QBA. This is achieved by measuring the motion in a special reference frame linked to an atomic spin system with an effective negative mass. Applications to force sensing [3], clock synchronization [4] and gravitational wave detection [5] will be discussed.



Monday, 23 April 2018,

16:30  get-together with coffe and snacks!

 Hlawka Hörsaal (HS9), Gußhausstraße 27-29, 1040 Vienna

The seminar talk will be preceded by a CoQuS Student talk at 17:00



Moritz Wenclawiak

TU Wien

"Strong coupling experiments in the THz regime"


Hosted by: Arno Rauschenbeutel


[1] E.S. Polzik and K.Hammerer.  Annalen der Physik. 527, No. 1–2, A15–A20 (2015). K. Hammerer et al,  PRL. 102, 020501 (2009).
[2] C. Møller et al. Nature, 547, 191 (2017).
[3] X. Huang, et al. arXiv:1801.02569.
[4] E. S. Polzik and J. Ye. PRA, 93, 021404 (2016).
[5] F. Khalili and E. S. Polzik, arXiv:1710.10405