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

TitleSuppressing the loss of ultracold molecules via the continuous quantum Zeno effect
Publication TypeJournal Article
Year of Publication2014
AuthorsZhu, B, Gadway, B, Foss-Feig, M, Schachenmayer, J, Wall, M, Hazzard, KRA, Yan, B, Moses, SA, Covey, JP, Jin, DS, Ye, J, Holland, M, Rey, AMaria
JournalPhysical Review Letters
Date Published2014/2/20

We investigate theoretically the suppression of two-body losses when the
on-site 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
one-dimensional tubes with a weak lattice along the tubes [Yan et al., Nature
501, 521-525 (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 single-band 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 mean-field model and benchmark it with
numerically exact time-dependent density matrix renormalization group

Short TitlePhys. Rev. Lett.