Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 58, Number 12
Friday–Saturday, October 18–19, 2013; Denver, Colorado
Session I1: AMO III: Quantum Computing and Ultracold Dynamics |
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Chair: William Fairbank, Colorado State Unviersity Room: 151 |
Saturday, October 19, 2013 8:00AM - 8:24AM |
I1.00001: Two-dimensional quantum turbulence in Bose-Einstein condensates Invited Speaker: Brian Anderson One of the most challenging problems in the study of turbulence is the development of a quantitative understanding of the relationships between microscopic attributes of the flows, such as vortex dynamics, and statistical flow characteristics, such as energy spectra. Within the field of two-dimensional quantum turbulence (2DQT), this hurdle may be surmountable using atomic Bose-Einstein condensates. With highly oblate BECs, numerous experimental methods are available to generate the disordered distributions of quantized vortices associated with 2DQT, and new BEC and vortex detection and manipulation techniques are under development. In conjunction with experimental progress, analytical and numerical efforts are rapidly uncovering new aspects of vortices, microscopic flows, and energy spectra of 2DQT. This talk will introduce the study of 2DQT in BECs, mainly focusing on experimental progress and future directions in the investigation, manipulation, and detection of quantized vortices in 2DQT. [Preview Abstract] |
Saturday, October 19, 2013 8:24AM - 9:00AM |
I1.00002: Unexpected Ultracold Plasma Physics at Lower Densities: Oscillations and Evaporation Invited Speaker: Jacob Roberts We have constructed an experimental apparatus designed to confine ultracold plasmas in a modified Penning trap. As an unanticipated consequence of this design, the ultracold plasmas in our system are formed at significantly lower densities than is typically the case in experiments elsewhere. These lower densities allowed the observation of a qualitatively different type of resonant electron motion in response applied rf fields. Also, we found that lower ultracold plasma density enhanced the influence of evaporation on the cooling of the electrons as the ultracold plasma expands. These observations will be described along with an overview of planned future measurements to be conducted with our system. [Preview Abstract] |
Saturday, October 19, 2013 9:00AM - 9:12AM |
I1.00003: Algebraic and Numerical Algorithms for Quantum Evolution Ty Beus, Alberto Acevedo, Manuel Berrondo, Jean-Francois S. Van Huele Quantum evolution requires the manipulation of infinite series of products of non-commuting operators. Lie algebra techniques allow us to reduce the time-dependent operator calculus to the solution of a set of coupled differential equations for scalar functions, while automatically guaranteeing unitarity of the factorized evolution operator. We discuss the development of computer programs to implement this technique of combined factorization and application to quantum states. We use them on driven anharmonic and optomechanical oscillators to find how transition probabilities in these systems evolve in time. [Preview Abstract] |
Saturday, October 19, 2013 9:12AM - 9:24AM |
I1.00004: The quest for greater strong coupling in ultracold neutral plasmas Mary Lyon, Scott Bergeson In most physical systems, a few energy scales appear naturally. For interacting many-body systems such as ions in a plasma, electrons in a metal, or even Bose-Einstein condensates or nuclear collisions, the two most natural energy scales are the average energy per particle and the average nearest-neighbor potential energy. When the ratio of nearest-neighbor potential energy to kinetic energy is greater than 1, we say that the system is ``strongly coupled.'' When this happens, the system can display medium- to long-range many-body behavior that is more typical of a glass or crystal rather than a gas of atoms. In our experiments, we are working with plasmas in this exotic regime. The plasmas are created by photo-ionizing laser-cooled atoms. The ratio of energy scales in our work is about 2. Of course, we would like to see this number increase to something like 100, making our plasmas more like fluffy crystals than disordered liquids. In my talk I will describe our work and some of the things we are doing to make our plasma ions extremely cold. [Preview Abstract] |
Saturday, October 19, 2013 9:24AM - 9:36AM |
I1.00005: Cavity-aided non-demolition measurements for enhanced spin squeezing Matthew Norcia, Justin Bohnet, Kevin Cox, Joshua Weiner, Zilong Chen, James Thompson Projection noise sets a maximum resolution for all sensors that use population measurements of unentangled atoms to sense a quantum phase -- the ``Standard Quantum Limit.'' This limitation can be overcome through the use of entangled, ``squeezed'' ensembles of atoms, allowing for potential improvements in sensor performance. We use quantum non-demolition measurements to prepare and directly observe spin-squeezed states with phase resolution 10.2(6)dB below the SQL, with no background subtraction. [Preview Abstract] |
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