Bulletin of the American Physical Society
9th Annual Meeting of the Northwest Section of the APS
Volume 52, Number 6
Thursday–Saturday, May 17–19, 2007; Pocatello, Idaho
Session E3: Atomic, Molecular, and Optical Physics |
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Chair: Boris Blinov, University of Washington Room: PSUB Clearwater Room |
Saturday, May 19, 2007 2:00PM - 2:45PM |
E3.00001: Continuous Measurement of Atomic Motion Invited Speaker: Quantum mechanics is fundamentally a theory of measurement, and recently a paradigm in quantum optics has arisen for describing the \textit{continuous} measurement of quantum systems. Interesting phenomena can happen in continuously observed systems, due to the interplay of the dynamical evolution and the measurement process. In particular, the evolution of a quantum system under a continuous measurement process is both \textit{nonlinear} and \textit{stochastic}. I will describe our interests in continuous measurements of atomic motion, especially in applying continuous measurements to realizing quantum feedback control of atomic motion and to understanding the quantum--classical transition. I will also describe our experimental progress towards studying these systems. Finally, I will end with a model of a continuous measurement of the position of an atom that operates via the imaging of scattered laser light---a ``continuous Heisenberg microscope''---that has a surprising result: the information gained via the measurement in an intuitively ``good'' setup is much less that you would expect by considering the \textit{efficiency} of the measurement. [Preview Abstract] |
Saturday, May 19, 2007 2:45PM - 3:00PM |
E3.00002: Hartree simulations of multi-electron atoms ionization in strong laser fields Matt Kalinski The recent success of classical simulations of the ionization process of few electron atom is an argument that normal electron exchange and correlations effects are negligible for certain conditions of strong field ionization and only the Coulomb effects are essential [1]. The numerical convenience of solving the Schr{\"o}dinger equation with nonlinearity instead of classical equations of the motion has been recently proved by us in case of so-called Trojan electrons in strong CP fields with Shay logarithmic quantum mechanics [2]. We present Hartree simulations of the ultra-strong field time-dependent ionization of model one dimensional atoms with up to 10 active electrons involved (10 dimensional configuration space). N coupled Schr{\"o}dinger equations is solved simultaneously on the Cartesian grid with our new nonlinear split-operator method. The continuum states are taken into account with delta grid representation of the multi electron wavefunction and the Coulomb interaction integral is calculated as the direct solution of the Poisson equation with the ultra-fast Fast Fourier convolution method developed by us to treat the supersolid formation in Bose-Einstein condensate. We calculate n-electron ionization rates for ultra-strong ultra-short few cycle pulses. [1] P. J. Ho and J. H. Eberly, Phys. Rev. Lett. {\bf 95}, 193002 (2005). [2] M. Kalinski, contributed paper, APS DAMOP meeting, Lincoln, Nebraska, May, 2005 [Preview Abstract] |
Saturday, May 19, 2007 3:00PM - 3:30PM |
E3.00003: Coffee Break
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Saturday, May 19, 2007 3:30PM - 3:45PM |
E3.00004: Utra-bright compact sources of correlated photons based on SPDC in periodically-poled KTP Ray Beausoleil, Marco Fiorentino, Sean Spillane, Tony Roberts, Phil Battle, Mark Munroe Photon pairs generated using spontaneous parametric down- conversion (SPDC) have been a central ingredient for a number of quantum optics experiments ranging from the generation of entanglement to demonstrations of quantum information processing protocols. The flux of pairs generated by SPDC sources has been steadily growing over the years opening the door to practical applications of correlated and entangled photon pairs. SPDC sources based on periodically poled waveguides have shown a great potential to generate large numbers of correlated pairs with a few $\mu$W of pump. These works, however, lack a clear explanation of the increased pair rate in waveguides and do not directly compare the waveguide result with bulk. Na\"{\i}vely, field confinement in waveguides is not expected to enhance pair generation rate, since SPDC is a scattering phenomenon that only involves \emph{one} pump photon and therefore does not benefit from higher photon densities created by focussing. In this talk we present a theoretical and experimental comparison of spontaneous parametric down-conversion in periodically poled waveguides and bulk KTP crystals. We measured a waveguide pair generation rate of $2.9 \cdot 10^6$ pairs/s per mW of pump in a 1-nm band: more than 50 times higher than the bulk crystal generation rate. [Preview Abstract] |
Saturday, May 19, 2007 3:45PM - 4:00PM |
E3.00005: Tunneling between 2D electron layers with correlated disorder: anomalous sensitivity to spin-orbit coupling Vladimir Zyuzin, Eugene Mishchenko, Mikhail Raikh Tunneling between two-dimensional electron layers with mutually correlated disorder potentials is studied theoretically. Due to this correlation, the diffusive eigenstates in different layers are almost orthogonal to each other. As a result, a peak in the tunnel $I$-$V$ characteristics shifts towards small bias, $V$. If the correlation in disorder potentials is complete, the peak position and width are governed by the spin-orbit coupling in the layers; this coupling lifts the orthogonality of the eigenstates. Possibility to use inter-layer tunneling for experimental determination of weak {\em intrinsic} spin-orbit splitting of the Fermi surface is discussed. [Preview Abstract] |
Saturday, May 19, 2007 4:00PM - 4:15PM |
E3.00006: The Lennard-Jones oscillator in quantum Hamilton-Jacobi theory M.K. Balasubramanya, M.W. Roth We present a new scheme for calculating the energy eigenvalues of an oscillator modeled using the Lennard-Jones (12,6) potential for the zero angular momentum case. The eigenvalues are calculated using the quantum Hamilton-Jacobi theory making use of the action variable without obtaining a full solution of the dynamical equation. The energy eigenvalues so obtained are compared with those calculated numerically. [Preview Abstract] |
Saturday, May 19, 2007 4:15PM - 4:27PM |
E3.00007: Spectroscopic measurements of Ba+ Joseph Pirtle, Ryan Bowler, Sanghoon Chong, Matt Dietrich, Gary Howell, Adam Kleczewski, Nathan Kurz, Viki Mirgon, Phil Nelsen, Joanna Salacka, Gang Shu, Li Wang, Boris Blinov Our goal is to measure the atomic structure of Ba$^{+}$ to a new degree of accuracy. We confine and laser-cool a single barium ion in an RF quadrupole. We intend on measuring the branching ratios for the 6P$_{3/2 }$ - 5D$_{5/2}$ and the 6P$_{3/2 }$ - 5D$_{3/2}$ decays in Ba$^{+}$. The measurement is achieved by first exiting the ion to the 6P$_{3/2}$ state with a short duration of a 455 nm shelving laser. We then allow the ion to decay, which will result in one of three states: 5D$_{5/2}$, 5D$_{3/2}$, and 6S1$_{/2}$. Next we use a 650 nm laser to re-pump the ion out of the 5D$_{3/2}$ into the 6P$_{1/2}$ and another 493nm to transition from 6S$_{1/2}$ to 6P$_{1/2}$. If the ion fluoresces in this 6S$_{1/2}$ - 6P$_{1/2}$ - 5D$_{3/2}$ cycle then we know the original decay out of 6P$_{3/2}$ was into either 5D$_{3/2}$ or 6S$_{1/2}$. By incrementally increasing the duration of the 455 nm excitation the probability of decay into the 6S$_{1/2}$ is exponentially decreased. With enough data points we can extrapolate the saturation between the probabilities of fluorescent and non- fluorescent cycles. The branching ratio between the decays into the 5D$_{5/2}$ and 5D$_{3/2 }$states is the ratio of these probabilities in this limit. Our future experiments include the precision RF spectroscopy of the 5D$_{5/2}$ state in $^{137}$Ba$^{+}$ and the measurement of the 5D$_{5/2}$ state lifetime. [Preview Abstract] |
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