%0 Journal Article
%J Physical Review Letters
%D 2014
%T Many-body dynamics of dipolar molecules in an optical lattice
%A Kaden R. A. Hazzard
%A Bryce Gadway
%A Michael Foss-Feig
%A Bo Yan
%A Steven A. Moses
%A Jacob P. Covey
%A Norman Y. Yao
%A Mikhail D. Lukin
%A Jun Ye
%A Deborah S. Jin
%A Ana Maria Rey
%X 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.
%B Physical Review Letters
%V 113
%8 2014/11/7
%G eng
%U http://arxiv.org/abs/1402.2354v1
%N 19
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.113.195302
%0 Journal Article
%J Physical Review Letters
%D 2014
%T Suppressing the loss of ultracold molecules via the continuous quantum Zeno effect
%A Bihui Zhu
%A Bryce Gadway
%A Michael Foss-Feig
%A Johannes Schachenmayer
%A Michael Wall
%A Kaden R. A. Hazzard
%A Bo Yan
%A Steven A. Moses
%A Jacob P. Covey
%A Deborah S. Jin
%A Jun Ye
%A Murray Holland
%A Ana Maria Rey
%X 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.
%B Physical Review Letters
%V 112
%8 2014/2/20
%G eng
%U http://arxiv.org/abs/1310.2221v2
%N 7
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.112.070404
%0 Journal Article
%J Science
%D 2013
%T A quantum many-body spin system in an optical lattice clock
%A M J Martin
%A Bishof, M
%A Swallows, M D
%A X Zhang
%A C Benko
%A J von-Stecher
%A Alexey V. Gorshkov
%A Rey, A M
%A Jun Ye
%B Science
%V 341
%P 632
%G eng
%U http://www.sciencemag.org/content/341/6146/632.abstract
%0 Journal Article
%J Physical Review Letters
%D 2013
%T Realizing Fractional Chern Insulators with Dipolar Spins
%A Norman Y. Yao
%A Alexey V. Gorshkov
%A Chris R. Laumann
%A Andreas M. LĂ¤uchli
%A Jun Ye
%A Mikhail D. Lukin
%X 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.
%B Physical Review Letters
%V 110
%8 2013/4/29
%G eng
%U http://arxiv.org/abs/1212.4839v1
%N 18
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.110.185302
%0 Journal Article
%J Physical Review Letters
%D 2012
%T Long-lived dipolar molecules and Feshbach molecules in a 3D optical lattice
%A Amodsen Chotia
%A Brian Neyenhuis
%A Steven A. Moses
%A Bo Yan
%A Jacob P. Covey
%A Michael Foss-Feig
%A Ana Maria Rey
%A Deborah S. Jin
%A Jun Ye
%X 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.
%B Physical Review Letters
%V 108
%8 2012/2/23
%G eng
%U http://arxiv.org/abs/1110.4420v1
%N 8
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.108.080405
%0 Journal Article
%J Physical Review Letters
%D 2011
%T Resolved atomic interaction sidebands in an optical clock transition
%A Michael Bishof
%A Yige Lin
%A Matthew D. Swallows
%A Alexey V. Gorshkov
%A Jun Ye
%A Ana Maria Rey
%X 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.
%B Physical Review Letters
%V 106
%8 2011/6/22
%G eng
%U http://arxiv.org/abs/1102.1016v2
%N 25
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.106.250801
%0 Journal Article
%J Physical Review Letters
%D 2011
%T Tunable Superfluidity and Quantum Magnetism with Ultracold Polar Molecules
%A Alexey V. Gorshkov
%A Salvatore R. Manmana
%A Gang Chen
%A Jun Ye
%A Eugene Demler
%A Mikhail D. Lukin
%A Ana Maria Rey
%X 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.
%B Physical Review Letters
%V 107
%8 2011/9/8
%G eng
%U http://arxiv.org/abs/1106.1644v1
%N 11
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.107.115301
%0 Journal Article
%J Physical Review Letters
%D 2009
%T Alkaline-Earth-Metal Atoms as Few-Qubit Quantum Registers
%A Alexey V. Gorshkov
%A Ana Maria Rey
%A Andrew J. Daley
%A Martin M. Boyd
%A Jun Ye
%A Peter Zoller
%A Mikhail D. Lukin
%X 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.
%B Physical Review Letters
%V 102
%8 2009/3/18
%G eng
%U http://arxiv.org/abs/0812.3660v2
%N 11
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.102.110503