A compact and fast magnetic coil for the manipulation of quantum gases with Feshbach resonances

Abstract

Cold atom experiments commonly use broad magnetic Feshbach resonances to manipulate the interaction between atoms. In order to induce quantum dynamics by a change in the interaction strength, rapid (∼μs) magnetic field changes over several tens of Gauss are required. Here, we present a compact design of a coil and its control circuit for a change in the magnetic field up to 36 G in 3 µs. The setup comprises two concentric solenoids with minimal space requirements, which can be readily added to existing apparatuses. This design makes the observation of non-equilibrium physics with broad Feshbach resonances accessible.

Enhanced measurement precision with continuous interrogation during dynamical decoupling

“…(ii) The rapid reversion of the bias field (in the order of ∼ 1 µs) was achieved in experiments without introducing adiabatic Landau-Zener transitions between atoms in different spin components. [56] Therefore we may neglect the short reversion time of the bias field during our numerical simulations. (iii) To measure J y in a spin-1 BEC experiment, one may employ continuous measurement using magneto-optical imaging techniques, [55] or projective measurement using the Stern-Gerlach technique after an additional π/2 pulse which rotates the condensate spin to z direction.…”