Bulletin of the American Physical Society
47th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 61, Number 8
Monday–Friday, May 23–27, 2016; Providence, Rhode Island
Session C2: DAMOP Thesis Prize SessionInvited

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Chair: Alex Kuzmich, University of Michigan Room: Ballroom B 
Tuesday, May 24, 2016 2:00PM  2:30PM 
C2.00001: Laser cooling atoms to indistinguishability: Atomic HongOuMandel interference and entanglement through spin exchange Invited Speaker: Adam Kaufman Motional control of neutral atoms has a rich history and increasingly interest has turned to singleatom control. In my thesis work, we created a platform to individually prepare single bosonic atoms in highly pure quantum states, by developing methods to laser cool single atoms to the vibrational ground state of optical tweezer traps. Applying this toolset, we observe the atomic HongOuMandel effect when we arrange for atom tunneling to play the role of a balanced beam splitter between two optical tweezers. In another experiment, we utilize spin exchange to create entanglement, which we then verify after spatially separating the atoms to observe their nonlocal correlations. Merging these results with our recent demonstration of deterministic loading of atomic arrays, our results establish the concept of quantum gas assembly, which could be applied to a variety of systems ranging from the production of single dipolar molecules to the assembly of lowentropy arrays of atoms. [Preview Abstract] 
Tuesday, May 24, 2016 2:30PM  3:00PM 
C2.00002: Test of Lorentz symmetry with trapped ions Invited Speaker: Thaned Pruttivarasin The outcome of an experiment should not depend on the orientation of the apparatus in space. This important cornerstone of physics is deeply engrained into the Standard Model of Physics by requiring that all fields must be Lorentz invariant. However, it is wellknown that the Standard Model is incomplete. Some theories conjecture that at the Planck scale Lorentz symmetry might be broken and measurable at experimentally accessible energy scales. Therefore, a search for violation of Lorentz symmetry directly probes physics beyond the Standard model. We present a novel experiment utilizing trapped calcium ions as a direct probe of Lorentzviolation in the electronphoton sector. We monitor the energy between atomic states with different orientations of the electronic wavefunctions as they rotate together with the motion of the Earth. This is analogous to the famous MichelsonMorley experiment. To remove magnetic field noise, we perform the experiment with the ions prepared in the decoherencefree states. Our result improves on the most stringent bounds on Lorentz symmetry for electrons by 100 times. The experimental scheme is readily applicable to many ion species, hence opening up paths toward much improved test of Lorentz symmetry in the future. [Preview Abstract] 
Tuesday, May 24, 2016 3:00PM  3:30PM 
C2.00003: Artificial gauge fields and topology with ultracold atoms in optical lattices Invited Speaker: Monika Aidesburger Many intriguing condensed matter phenomena such as the integer and fractional quantum Hall effect arise due to the nontrivial topological properties of the underlying system. Synthetic materials that consist of ultracold neutral atoms confined in crystallike structures using laser beams have the potential to simulate and address the complex questions that arise in this context. In this talk I report on the experimental realization of extremely strong artificial magnetic fields based on laserassisted tunneling which give rise to topological energy bands. Their properties are characterized by topological invariants  the Chern numbers  which are at the origin of the integer quantum Hall effect. In particular we were able to realize the Hofstadter model for an effective flux 1/4 and determined the Chern number of the lowest energy band through a direct measurement of bulk topological currents. These experimental results pave the way for future studies of interacting topological systems with ultracold atoms in optical lattices. [Preview Abstract] 
Tuesday, May 24, 2016 3:30PM  4:00PM 
C2.00004: Topological phases and polaron physics in ultracold quantum gases Invited Speaker: Fabian Grusdt The description of quantum manybody systems poses a formidable theoretical challenge. A seemingly simple problem is the coupling of a single impurity atom to noninteracting Bogoliubov phonons in a surrounding BoseEinstein condensate. The system can be described by a polaron model at intermediate couplings  an 80 year problem. The situation has been realized experimentally, but when the impurity mass is small compared to the Boson mass, neither meanfield nor strongcoupling expansions are valid anymore. Now the impurity acts as an exchange particle, mediating phononphonon interactions. In this talk I present a semianalytical solution to the polaron problem. I will show that the approach can be generalized to solve farfrom equilibrium polaron problems, too, and elaborate on connections with recent experiments involving ultracold atoms and photons. A completely different class of manybody problems are systems with topological order. In recent years we have seen an uprise of coldatomic or photonic implementations of artificial gauge fields, providing a corner stone for the realization of topological phases of matter. In the second part of my talk, I will address the challenging problem how nonlocal topological orders can be detected. It will be demonstrated that manybody topological invariants can be measured, making use of mobile impurities as coherent probes of the highly entangled groundstates. I will discuss Laughlin states and comment on possible realizations using ultracold atoms. [Preview Abstract] 
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