Multi-second magnetic coherence in a single domain spinor Bose–Einstein condensate

Silvana Palacios, Simon Coop, Pau Gomez, Thomas Vanderbruggen, Y. Natali Martinez de Escobar, Martijn Jasperse, Morgan W Mitchell
2018 New Journal of Physics  
We describe a compact, robust and versatile system for studying magnetic dynamics in a spinor Bose-Einstein condensate. Condensates of 87 Rb are produced by all-optical evaporation in a 1560 nm optical dipole trap, using a non-standard loading sequence that employs an auxiliary 1529 nm beam for partial compensation of the strong differential light shift induced by the dipole trap itself. We use near-resonance Faraday rotation probing to non-destructively track the condensate magnetization, and
more » ... emonstrate few-Larmor-cycle tracking with no detectable degradation of the spin polarization. In the ferromagnetic F = 1 ground state, we observe magnetic T1 and T2^* coherence times limited only by the several-second residence time of the atoms in the trap.
doi:10.1088/1367-2630/aab2a0 fatcat:fyqopctk2vfp7g6acwvygwmjwu