



01233nas a2200157   4500008004100000245006500041210006300106260001400169490000800183520075800191100002300949700002200972700002400994700002001018856003701038       2012                        eng d00aSteady-state many-body entanglement of hot reactive fermions0 aSteadystate manybody entanglement of hot reactive fermions  c2012/12/40 v1093 a  Entanglement is typically created via systematic intervention in the time
evolution of an initially unentangled state, which can be achieved by coherent
control, carefully tailored non-demolition measurements, or dissipation in the
presence of properly engineered reservoirs. In this paper we show that
two-component Fermi gases at ~\mu K temperatures naturally evolve, in the
presence of reactive two-body collisions, into states with highly entangled
(Dicke-type) spin wavefunctions. The entanglement is a steady-state property
that emerges---without any intervention---from uncorrelated initial states, and
could be used to improve the accuracy of spectroscopy in experiments with
fermionic alkaline earth atoms or fermionic groundstate molecules.
1 aFoss-Feig, Michael1 aDaley, Andrew, J.1 aThompson, James, K.1 aRey, Ana, Maria  uhttp://arxiv.org/abs/1207.4741v1