Tunnelling Time of a Bose Einstein Condensate in an Atom Waveguide
May 10th, 2019 RAMÓN RAMOS University of Toronto

We report on measurements of the tunneling time of Bose-condensed Rubidium atoms in a one-dimensional system, tunneling through a 1-micron optical barrier. By localizing a pseudo-magnetic field inside the barrier and using the spin precession of the atoms to ’clock’ the time it takes for the atoms to pass through the classically forbidden region, we implement a Larmor measurement, as envisioned by Baz, Rybanchenko, and Buttiker. In the limit that this measurement is ’weak’, we are able to disentangle the back-action of the measurement from the inherent tunneling time. We measure a tunnelling time of 0.62(7) milliseconds through our barrier. Our results show good agreement with theory and shed light onto this long-standing problem.

Seminar, May 10, 2019, 12:00. ICFO’s Seminar Room

Hosted by Prof. Leticia Tarruell