@article {1480,
title = {Many-body dynamics of dipolar molecules in an optical lattice},
journal = {Physical Review Letters},
volume = {113},
year = {2014},
month = {2014/11/7},
abstract = { Understanding the many-body dynamics of isolated quantum systems is one of
the central challenges in modern physics. To this end, the direct experimental
realization of strongly correlated quantum systems allows one to gain insights
into the emergence of complex phenomena. Such insights enable the development
of theoretical tools that broaden our understanding. Here, we theoretically
model and experimentally probe with Ramsey spectroscopy the quantum dynamics of
disordered, dipolar-interacting, ultracold molecules in a partially filled
optical lattice. We report the capability to control the dipolar interaction
strength, and we demonstrate that the many-body dynamics extends well beyond a
nearest-neighbor or mean-field picture, and cannot be quantitatively described
using previously available theoretical tools. We develop a novel cluster
expansion technique and demonstrate that our theoretical method accurately
captures the measured dependence of the spin dynamics on molecule number and on
the dipolar interaction strength. In the spirit of quantum simulation, this
agreement simultaneously benchmarks the new theoretical method and verifies our
microscopic understanding of the experiment. Our findings pave the way for
numerous applications in quantum information science, metrology, and condensed
matter physics.
},
doi = {10.1103/PhysRevLett.113.195302},
url = {http://arxiv.org/abs/1402.2354v1},
author = {Kaden R. A. Hazzard and Bryce Gadway and Michael Foss-Feig and Bo Yan and Steven A. Moses and Jacob P. Covey and Norman Y. Yao and Mikhail D. Lukin and Jun Ye and Deborah S. Jin and Ana Maria Rey}
}
@article {1479,
title = {Suppressing the loss of ultracold molecules via the continuous quantum Zeno effect
},
journal = {Physical Review Letters},
volume = {112},
year = {2014},
month = {2014/2/20},
abstract = { 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
calculations.
},
doi = {10.1103/PhysRevLett.112.070404},
url = {http://arxiv.org/abs/1310.2221v2},
author = {Bihui Zhu and Bryce Gadway and Michael Foss-Feig and Johannes Schachenmayer and Michael Wall and Kaden R. A. Hazzard and Bo Yan and Steven A. Moses and Jacob P. Covey and Deborah S. Jin and Jun Ye and Murray Holland and Ana Maria Rey}
}
@article {1842,
title = {A quantum many-body spin system in an optical lattice clock},
journal = {Science},
volume = {341},
year = {2013},
pages = {632},
url = {http://www.sciencemag.org/content/341/6146/632.abstract},
author = {M J Martin and Bishof, M and Swallows, M D and X Zhang and C Benko and J von-Stecher and Alexey V. Gorshkov and Rey, A M and Jun Ye}
}
@article {1185,
title = {Realizing Fractional Chern Insulators with Dipolar Spins},
journal = {Physical Review Letters},
volume = {110},
year = {2013},
month = {2013/4/29},
abstract = { Strongly correlated quantum systems can exhibit exotic behavior controlled by
topology. We predict that the \nu=1/2 fractional Chern insulator arises
naturally in a two-dimensional array of driven, dipolar-interacting spins. As a
specific implementation, we analyze how to prepare and detect synthetic gauge
potentials for the rotational excitations of ultra-cold polar molecules trapped
in a deep optical lattice. While the orbital motion of the molecules is pinned,
at finite densities, the rotational excitations form a fractional Chern
insulator. We present a detailed experimental blueprint for KRb, and
demonstrate that the energetics are consistent with near-term capabilities.
Prospects for the realization of such phases in solid-state dipolar systems are
discussed as are their possible applications.
},
doi = {10.1103/PhysRevLett.110.185302},
url = {http://arxiv.org/abs/1212.4839v1},
author = {Norman Y. Yao and Alexey V. Gorshkov and Chris R. Laumann and Andreas M. L{\"a}uchli and Jun Ye and Mikhail D. Lukin}
}
@article {1476,
title = {Long-lived dipolar molecules and Feshbach molecules in a 3D optical lattice
},
journal = {Physical Review Letters},
volume = {108},
year = {2012},
month = {2012/2/23},
abstract = { We have realized long-lived ground-state polar molecules in a 3D optical
lattice, with a lifetime of up to 25 s, which is limited only by off-resonant
scattering of the trapping light. Starting from a 2D optical lattice, we
observe that the lifetime increases dramatically as a small lattice potential
is added along the tube-shaped lattice traps. The 3D optical lattice also
dramatically increases the lifetime for weakly bound Feshbach molecules. For a
pure gas of Feshbach molecules, we observe a lifetime of >20 s in a 3D optical
lattice; this represents a 100-fold improvement over previous results. This
lifetime is also limited by off-resonant scattering, the rate of which is
related to the size of the Feshbach molecule. Individually trapped Feshbach
molecules in the 3D lattice can be converted to pairs of K and Rb atoms and
back with nearly 100\% efficiency.
},
doi = {10.1103/PhysRevLett.108.080405},
url = {http://arxiv.org/abs/1110.4420v1},
author = {Amodsen Chotia and Brian Neyenhuis and Steven A. Moses and Bo Yan and Jacob P. Covey and Michael Foss-Feig and Ana Maria Rey and Deborah S. Jin and Jun Ye}
}
@article {1183,
title = {Resolved atomic interaction sidebands in an optical clock transition},
journal = {Physical Review Letters},
volume = {106},
year = {2011},
month = {2011/6/22},
abstract = { We report the observation of resolved atomic interaction sidebands (ISB) in
the ${}^{87}$Sr optical clock transition when atoms at microkelvin temperatures
are confined in a two-dimensional (2D) optical lattice. The ISB are a
manifestation of the strong interactions that occur between atoms confined in a
quasi-one-dimensional geometry and disappear when the confinement is relaxed
along one dimension. The emergence of ISB is linked to the recently observed
suppression of collisional frequency shifts in [1]. At the current
temperatures, the ISB can be resolved but are broad. At lower temperatures, ISB
are predicted to be substantially narrower and usable as powerful spectroscopic
tools in strongly interacting alkaline-earth gases.
},
doi = {10.1103/PhysRevLett.106.250801},
url = {http://arxiv.org/abs/1102.1016v2},
author = {Michael Bishof and Yige Lin and Matthew D. Swallows and Alexey V. Gorshkov and Jun Ye and Ana Maria Rey}
}
@article {1198,
title = {Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
},
journal = {Physical Review Letters},
volume = {107},
year = {2011},
month = {2011/9/8},
abstract = { By selecting two dressed rotational states of ultracold polar molecules in an
optical lattice, we obtain a highly tunable generalization of the t-J model,
which we refer to as the t-J-V-W model. In addition to XXZ spin exchange, the
model features density-density interactions and novel density-spin
interactions; all interactions are dipolar. We show that full control of all
interaction parameters in both magnitude and sign can be achieved independently
of each other and of the tunneling. As a first step towards demonstrating the
potential of the system, we apply the density matrix renormalization group
method (DMRG) to obtain the 1D phase diagram of the simplest experimentally
realizable case. Specifically, we show that the tunability and the long-range
nature of the interactions in the t-J-V-W model enable enhanced superfluidity.
Finally, we show that Bloch oscillations in a tilted lattice can be used to
probe the phase diagram experimentally.
},
doi = {10.1103/PhysRevLett.107.115301},
url = {http://arxiv.org/abs/1106.1644v1},
author = {Alexey V. Gorshkov and Salvatore R. Manmana and Gang Chen and Jun Ye and Eugene Demler and Mikhail D. Lukin and Ana Maria Rey}
}
@article {1193,
title = {Alkaline-Earth-Metal Atoms as Few-Qubit Quantum Registers},
journal = {Physical Review Letters},
volume = {102},
year = {2009},
month = {2009/3/18},
abstract = { We propose and analyze a novel approach to quantum information processing, in
which multiple qubits can be encoded and manipulated using electronic and
nuclear degrees of freedom associated with individual alkaline-earth atoms
trapped in an optical lattice. Specifically, we describe how the qubits within
each register can be individually manipulated and measured with sub-wavelength
optical resolution. We also show how such few-qubit registers can be coupled to
each other in optical superlattices via conditional tunneling to form a
scalable quantum network. Finally, potential applications to quantum
computation and precision measurements are discussed.
},
doi = {10.1103/PhysRevLett.102.110503},
url = {http://arxiv.org/abs/0812.3660v2},
author = {Alexey V. Gorshkov and Ana Maria Rey and Andrew J. Daley and Martin M. Boyd and Jun Ye and Peter Zoller and Mikhail D. Lukin}
}