Title  Suppressing the loss of ultracold molecules via the continuous quantum Zeno effect

Publication Type  Journal Article 
Year of Publication  2014 
Authors  Zhu, B, Gadway, B, FossFeig, M, Schachenmayer, J, Wall, M, Hazzard, KRA, Yan, B, Moses, SA, Covey, JP, Jin, DS, Ye, J, Holland, M, Rey, AMaria 
Journal  Physical Review Letters 
Volume  112 
Issue  7 
Date Published  2014/2/20 
Abstract  We investigate theoretically the suppression of twobody losses when the
onsite loss rate is larger than all other energy scales in a lattice. This
work quantitatively explains the recently observed suppression of chemical
reactions between two rotational states of fermionic KRb molecules confined in
onedimensional tubes with a weak lattice along the tubes [Yan et al., Nature
501, 521525 (2013)]. New loss rate measurements performed for different
lattice parameters but under controlled initial conditions allow us to show
that the loss suppression is a consequence of the combined effects of lattice
confinement and the continuous quantum Zeno effect. A key finding, relevant for
generic strongly reactive systems, is that while a singleband theory can
qualitatively describe the data, a quantitative analysis must include multiband
effects. Accounting for these effects reduces the inferred molecule filling
fraction by a factor of five. A rate equation can describe much of the data,
but to properly reproduce the loss dynamics with a fixed filling fraction for
all lattice parameters we develop a meanfield model and benchmark it with
numerically exact timedependent density matrix renormalization group
calculations.

URL  http://arxiv.org/abs/1310.2221v2 
DOI  10.1103/PhysRevLett.112.070404 
Short Title  Phys. Rev. Lett. 