Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session R04: Nonlinear and Manybody Physics 
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Chair: Svetlana Malinovskaya, Stevens Institute of Technology Room: Grand C 
Thursday, May 31, 2018 10:30AM  10:42AM 
R04.00001: Manybody physics with spin states of Rydberg atoms Elliot Pachniak, Svetlana Malinovskaya Rydberg atoms with very high principal quantum numbers trapped in a optical trap are used to study the collective spin properties of ultracold atomic systems. The interaction Hamiltonian of collective spin states of ultracold Rydberg atoms were explored in diatomic and triatomic chains in pursuit of the development of a robust algorithm for many body N atomic chains. Superposition states were designed where the ground and Rydberg states became entangled in an orderly array, which will be referred to as an entangled crystalline state. The characteristics of entangled crystalline states were observed using quantum control methodology in both diatomic and triatomic chains. [Preview Abstract] 
Thursday, May 31, 2018 10:42AM  10:54AM 
R04.00002: Coherent MicrowavetoOptical Conversion via SixWave Mixing in Rydberg Atoms Christian Gross, Thibault Vogt, Jingshan Han, Dieter Jaksch, Martin Kiffner, Wenhui Li Interconversion of microwave and optical fields is essential for connecting superconducting qubits and optical photons in future quantum information networks. To achieve the transfer of quantum states between microwave and optical photons, coherent, efficient, and broadband conversion will be required. Here we demonstrate a coherent microwavetooptical conversion via frequency mixing in Rydberg atoms [1]. In contrast to other physical systems being explored, our scheme requires no cavity and allows freespace and broadband conversion due to the strong coupling of microwaves to Rydberg transitions. Moreover, using electromagnetically induced transparency strongly enhances the efficiency of this process. Our results are in excellent agreement with theoretical predictions based on singleatom physics and indicate that this approach, with optimized geometry and energy level configuration, can lead to a nearunity photon conversion efficiency. [1] J. Han, T. Vogt, Ch. Gross, D. Jaksch, M. Kiffner, and W. Li, arXiv:1701.07969 (2017), accepted for publication in Phys. Rev. Lett. [Preview Abstract] 
Thursday, May 31, 2018 10:54AM  11:06AM 
R04.00003: Spatial and Temporal Correlations in a ColdAtom RydbergEIT System Michael Viray, Stephanie Miller, Georg Raithel Cold atoms in a Rydbergelectromagneticallyinducedtransparency (RydbergEIT) system are known to be strongly correlated, both spatially and temporally. Spatial correlations are due to the Rydberg blockade effect, while temporal correlations stem from, in addition to Rydberg blockade, the highly dispersive nature of EIT and propagation of Rydberg polaritons through the atomic medium. While these two sets of correlations have been studied individually, an analysis of their interplay would greatly benefit from simultaneous measurement of spatial and temporal correlations in one system. Our experiment investigates simultaneous spatial and temporal correlations of cold rubidium87 atoms in a RydbergEIT configuration. To measure spatial correlations, we use a highly magnifying atom imaging apparatus that allows us to extract the spatial $g^{(2)}(x,y)$ in the imaging plane. The temporal correlation function $g^{(2)}(t)$ is obtained using a single photon counting module (SPCM). We discuss the experimental methods used and report our initial experimental results. [Preview Abstract] 

R04.00004: ABSTRACT WITHDRAWN This abstract has been withdrawn. [Preview Abstract] 
Thursday, May 31, 2018 11:18AM  11:30AM 
R04.00005: Manybody physics of Cesium Rydberg molecules in high principal quantum number states* Jin Yang, Seth Rittenhouse, Hossein Sadeghpour, James Shaffer 
Thursday, May 31, 2018 11:30AM  11:42AM 
R04.00006: Abstract Withdrawn Complex electronic structure of Dysprosium atoms causes its particular properties such as high magnetic dipole moment or tensor nature of the ground state polarizability. On the one hand, it complicates the task of laser cooling, on the other hand, it provides special ways of atomic state manipulation. For example, inherent for Dysprosium lightinduced nonlinear spin coupling can be used for the preparation of nonclassical spin states. These states are promising for metrology below the standard quantum limit. In our experiment, we adopt such coupling for preparation of the NOON and the squeezed spin states. In order to prepare these states a cloud of ultracold gas of $^{164}$Dy confined in optical dipole trap is illuminated by a short offresonant pulse of light. We reconstruct the density matrix and the Wigner function of the prepared states and measure the time of decoherence. We demonstrate noticeable enhancement over the standard quantum limit for both the NOON and the squeezed states. 
Thursday, May 31, 2018 11:42AM  11:54AM 
R04.00007: Coincidence detection of correlated electronion pairs as a source of heralded ions Andrew McCulloch, Rory Speirs, Stephan Wissenberg, Rudy Tielen, Benjamin Sparkes, Robert Scholten We demonstrate a method for the deterministic production of single ions by exploiting the correlation between an electron and associated ion following ionization of atoms. Coincident detection and feedback in combination with Coulombdriven particle selection allows for highfidelity heralding of ions at a high repetition rate. Extension of the scheme beyond timecorrelated to position/momentumcorrelated feedback will provide a general and powerful means to optimize the ion beam brightness for the development of nextgeneration focused ion beam technologies. [Preview Abstract] 
Thursday, May 31, 2018 11:54AM  12:06PM 
R04.00008: Manybody physics of planepolarized dipoles in a quasi1D zigzag chain Niraj R. Ghimire, Susanne F. Yelin We study the quantum phases of a quasionedimensional zigzag chain of dipoles that are polarized in a plane by an external electric field. This simple system can be modeled using ultracold polar molecules, and be extended to study the topological quantities in triangular or hexagonal lattices. Since the Hamiltonian contains nearestneighbor and nextnearestneighbor hopping and interaction terms, the model does, however, allow for a rather complex phase diagram. Thus, this very simple model allows frustration and therefore phases that can be particularly interesting and unusual. We organize the system such that we can investigate the manybody effects effectively by using the density matrix renormalization group (DMRG) method. [Preview Abstract] 
Thursday, May 31, 2018 12:06PM  12:18PM 
R04.00009: Current reversals and metastable states in the infinite BoseHubbard chain with local particle loss Maximilian KieferEmmanouilidis, Jesko Sirker Manybody interactions lead to unexpected effects in the open BoseHubbard model. When the model is subjected to local loss, particle currents are induced. Away from the dissipative site the currents start to reverse their direction at intermediate and long times. This leads to a metastable state with a total particle current pointing away from the dissipative site. We studied the model numerically by combining a quantum trajectory approach with a densitymatrix renormalization group scheme. An alternative equation of motion approach based on an effective fermion model shows that the reversal of currents can be understood qualitatively by the creation of holondoublon pairs at the edge of the region of reduced particle density. The doublons are then able to escape while the holes move towards the dissipative site. [Preview Abstract] 
Thursday, May 31, 2018 12:18PM  12:30PM 
R04.00010: Nontraditional Quantum Heat Engine with Cold Atoms Yue Jiang, Yueyang Zou, Yefeng Mei, Xianxin Guo, Shengwang Du We demonstrated a nontraditional quantum heat engine (QHE) with laser cooled $^{\mathrm{85}}$Rb atoms basing on electromagnetically induced transparency (EIT), following a recent proposal by S. E. Harris [Phys. Rev. A~94, 053859 (2016)]. Making use of the EITinduced atomic coherence, we experimentally show that the directional radiation output from the QHE can have a spectral brightness 9 times higher than that of the ambient pumping reservoir, while there is no gain within the system. Our results violate detailed balance and Kirchhoff's law and may also be viewed as an early demonstration of a nontraditional coherencebased QHE. [Preview Abstract] 
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