Bulletin of the American Physical Society
2017 Annual Spring Meeting of the APS Ohio-Region Section
Volume 62, Number 6
Friday–Saturday, May 5–6, 2017; Ypsilanti, Michigan
Session E1: Contributed: Atomic, Molecular, Optical, and Plasmas Physics |
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Chair: Eric Paradis, Eastern Michigan University Room: Pray-Harrold 304 |
Saturday, May 6, 2017 9:00AM - 9:12AM |
E1.00001: Multiqubit entanglement and photonic localization in waveguide quantum electrodynamics (QED) Imran Mirza, John Schotland Chiral nanophotonic waveguides [Nature, 541, 473-480 (2017)], in which photonic emission can be set preferential in a particular direction, has seen a tremendous progress over the past few years. In particular, the applications of such waveguide-emitter platforms have shown promising applications in quantum communications and quantum information processing. In this talk, we'll discuss how waveguide chirality can enhance and prolong few-photon induced entanglement among many qubits in one-dimensional geometry [Phys. Rev. A 94, 012302 and 012309 (2016)]. Moreover, we'll also present how the presence of the qubit position disorder can form localized and extended photonic states which opens the possibility of using these waveguide QED setups as reliable single photon quantum memories. [Preview Abstract] |
Saturday, May 6, 2017 9:12AM - 9:24AM |
E1.00002: Vapor cell strong-field RF detection experiments Eric Paradis, Georg Raithel, David Anderson $\bf{Purpose:}$ Electromagnetically-induced transparency (EIT) in atomic vapors is used to measure RF fields. This work extends vapor cell RF field measurements up to strengths $>$ 1000 V/m. Methods: We use a custom rubidium vapor cell with a pair of internal electrodes to create strong DC and AC (0-500 MHz) electric fields, ranging up to the strong atom-field interaction regime with field strengths $>$1000 V/m. The EIT signal from a probe laser is used to measure applied electric fields. $\bf{Results:}$ The EIT signal is highly sensitive to the incident field. We were able to directly measure the RF field frequency using particular characteristics of the atomic level structure. Comparison to calculations provided accurate measurements of the field intensity. $\bf{Conclusion:}$ Vapor cell EIT can be used as an effective field sensor. Further advantages of this atom-based technique are the large dynamic range and avoiding the need for sensor calibration. [Preview Abstract] |
Saturday, May 6, 2017 9:24AM - 9:36AM |
E1.00003: A Numerically Exact Path Integral Approach for Time-Dependent Wave Functions Torrey Saxton, Allison Harris The Path Integral technique is an alternative formulation of quantum mechanics that is based on a Lagrangian approach. In its exact form, it is completely equivalent to the Hamiltonian-based Schr\"{o}dinger equation approach. Developed by Feynman in the 1940's, following inspiration from Dirac, the path integral approach has been widely used in high energy physics, quantum field theory, and statistical mechanics. However, only in limited cases has the path integral approach been applied to quantum mechanical few-body scattering. We will present a theoretical and computational development of the path integral method for use in the study of atomic collisions. Preliminary results will be presented for some simple systems, and numerical challenges will be discussed. [Preview Abstract] |
Saturday, May 6, 2017 9:36AM - 9:48AM |
E1.00004: Are bound states perturbative? Creighton Lisowski, Richard Pelphrey, Rainer Grobe, Q. Charles Su We compare the predictions of perturbation theory of arbitrary order for the ground state energy of very weakly bound states with the data obtained from the numerical diagonalization of the Schr\"{o}dinger Hamiltonian for attractive short-, finite- and zero-range one-dimensional potentials confined to a spatial box of length L. We find that in the weak-binding region where the ground state's spatial extension is larger than L the perturbation theory converges rapidly and is perfectly accurate. However, once the binding is so strong that the ground state's extension is less than L, the perturbative expansion becomes divergent, consistent with the expectation that bound states are intrinsically non-perturbative. However, for the zero-range potential a truncated Borel summation technique can recover the correct bound state energy from the diverging sum. We also show that perturbation theory becomes divergent in the vicinity of an avoided-level crossing. However, also here the numerical truncated Borel summation techniques can be applied to reproduce the correct finite energies from the diverging perturbative sums [Preview Abstract] |
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