Non-classical Atom-Interferometry and Interaction-free Measurements

Add to your list(s) Download to your calendar using vCal

• Wolfgang Ertmer (Hannover)
• Friday 16 January 2015, 15:00-16:00
• Small Lecture Theatre (S06, Poynting [R13]).

If you have a question about this talk, please contact Vincent Boyer.

This talk has been canceled/deleted

Highly sensitive quantum sensors based on ultra-cold atomic ensembles open for new horizons in inertial sensing. In addition, new developments and experimental tricks fields allow for fundamental tests and experiments. Entanglement, one of the most intriguing features of quantum mechanics, is nowadays a valuable resource for quantum engineering. For instance, an entangled input state can improve the sensitivity of an interferometer beyond the shot noise limit. Most prominently, quadrature-squeezed and spin-squeezed states are useful for this application. We experimentally demonstrate that the state is useful for sub-shot-noise interferometry.

The quantum Zeno effect predicts that a quantum mechanical transition can be suppressed by frequent measurements. Here, we demonstrate that a quantum phase transition can be suppressed by the continuous detection of the output phase. In our experiment we investigate spin-changing collisions in a Rb-87 Bose-Einstein condensate. For the first time, it is thus possible to detect the quantum Zeno effect indirectly. Our setup allows for interesting applications such as interaction-free measurements on the basis of neutral atoms.

This talk is part of the Cold Atoms series.

This talk is included in these lists:

This talk is not included in any other list

Note that ex-directory lists are not shown.