CoQuS Seminar Talk
by
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
by
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
