Suppressing the loss of ultracold molecules via the continuous quantum Zeno effect
Bihui Zhu, Bryce Gadway, Michael Foss-Feig,
Johannes Schachenmayer, Michael L. Wall,
Kaden R. A. Hazzard, Bo Yan, Steven A. Moses,
Jacob P. Covey, Deborah S. Jin, Jun Ye,
Murray Holland, and Ana Maria Rey
Physical Review
Letters 112, 070404 (2014) ["Editor's Suggestion"]
(
arXiv:1310.2221,
pdf)
In the News:
"Dealing
with loss", JILA Research Highlight
Summary
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 (London) 501, 521 (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 5. 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 calculations.
Bibtex
@article{PhysRevLett.112.070404,
title = {Suppressing the Loss of Ultracold Molecules Via the Continuous Quantum Zeno Effect},
author = {Zhu, B. and Gadway, B. and Foss-Feig, M. and Schachenmayer, J. and Wall, M.\,L. and Hazzard, K.\,R.\,A. and Yan, B. and Moses, S.\,A. and Covey, J.\,P. and Jin, D.\,S. and Ye, J. and Holland, M. and Rey, A.\,M.},
journal = {Phys. Rev. Lett.},
volume = {112},
issue = {7},
pages = {070404},
numpages = {5},
year = {2014},
month = {Feb},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.112.070404},
url = {http://link.aps.org/doi/10.1103/PhysRevLett.112.070404}
}