Bulletin of the American Physical Society
18th Annual Meeting of the APS Northwest Section,
Volume 62, Number 7
Thursday–Saturday, June 1–3, 2017; Forest Grove, Oregon
Session C3: Quantum Physics & Cold Gases |
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Room: Price Hall 204 |
Friday, June 2, 2017 1:30PM - 2:05PM |
C3.00001: Loop state-preparation-and-measurement tomography Invited Speaker: M. Beck We have performed an experiment demonstrating that loop state-preparation-and-measurement (SPAM) tomography is capable of detecting correlated errors between the preparation and the measurement of a quantum system. Specifically, we have prepared pure and mixed states of single qubits encoded in the polarization of heralded individual photons. By performing measurements using multiple state preparations and multiple measurement device settings we are able to detect if there are any correlated errors between them, and are also able to determine which state preparations are correlated with which measurements. This is accomplished by going around a “loop” in parameter space, which allows us to check for self-consistency. No assumptions are made concerning either the state preparations or the measurements, other than that the dimensions of the states and the positive-operator-valued measures (POVMs) describing the detector are known. In cases where no correlations are found we are able to perform quantum state tomography of the polarization qubits by using knowledge of the detector POVMs, or quantum detector tomography by using knowledge of the state preparations. Note, however, that the detection of correlated errors does not require estimating any state or measurement parameters.\\ \\In collaboration with: A. F. McCormick, Whitman College and Steven J. van Enk, University of Oregon. [Preview Abstract] |
Friday, June 2, 2017 2:05PM - 2:17PM |
C3.00002: Supersolid-like states in a spin-orbit coupled Bose-Einstein condensate Thomas Bersano, Vandna Gokhroo, Peter Engels Spin-orbit coupled BECs provide a powerful platform to investigate exotic quantum states. Among these, supersolids are particularly intriguing, exhibiting both superfluid and solid-like properties. In our experiment, we employ a Raman dressing scheme to generate a spin-orbit dispersion. States with different quasi-momentum are then coherently coupled by employing a suitably tailored optical lattice, effectively generating supersolid-like states. We demonstrate the coherent coupling mechanism by measuring Rabi oscillations between two quasi-momentum states. The current status and future direction of the experiment are discussed. [Preview Abstract] |
Friday, June 2, 2017 2:17PM - 2:29PM |
C3.00003: Shockwaves and Solitons in a Spin-Orbit Coupled BEC Edward Delikatny, Michael Forbes In this talk, I will present a microscopic description of the shockwaves and solitons that form when a trapped Bose-Einstein Condensate (BEC) is released and expands in the presence of Spin-Orbit Coupling (SOC). The SOC dispersion has regions of negative curvature $\left(\frac{\partial^2}{\partial k^2}E(k) < 0 \right)$ which emulate an effective negative mass. We seed the edges of the trapped BEC with momentums in the negative mass region, the edges then push against the outward expansion leading to a self-trapping phenomenon. Using negative mass hydrodynamics we see a build up and trapping of shockwaves in the center of the BEC. Although remarkably stable, the shockwaves ultimately decay into trains of solitons which lead to a dynamic instability of the trapped BEC. [Preview Abstract] |
Friday, June 2, 2017 2:29PM - 2:41PM |
C3.00004: Self-trapping in Cold Atoms from Negative Effective Mass Khalid Hossain, M. Khamehchi, M. Mossman, Yongping Zhang, Th. Busch, Michael Forbes, P. Engels Self-trapping phenomena have been observed in optical lattices but the expalanation is complicated because of the underlying lattice geometry. In this talk, we will describe a simple theory based on negative-mass hydrodynamics in a spin-orbit coupled (SOC) Bose-Einstien condensate (BEC) of $^{87}\text{Rb}$, and argue that self-trapping can be explained solely in terms of negative effective mass without any complications of lattice geometry. We have engineered the underlying dispersion relation with a negative curavature region exhibiting exquisite control over atomic interactions, which leads to a number of interesting effects, such as breaking of Galilean covariance, modulational instability and a slow down demonstrating negative acceleration. [Preview Abstract] |
Friday, June 2, 2017 2:41PM - 2:53PM |
C3.00005: Arbitrary Dipole Potentials with Controllable Intensity and Phase. Chunde Huang, Vandna Gokhroo, Peter Engels Optical dipole potentials are a very flexible tool to manipulate the dynamics of ultracold atoms. Here we use a digital micromirror device (DMD) to generate dipole potentials with customizable shape, phase and temporal control. Schemes to generate binary patterns in both the image plane and the Fourier plane are implemented. Distortions in the laser wavefront are removed using a phase front correction scheme in the Fourier plane. The Binarized Gerchberg-Saxton algorithm for generating binary hologram using a DMD will also be discussed. [Preview Abstract] |
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