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- P B Blakie, C Ticknor, A S Bradley, A M Martin, M J Davis, Y Kawaguchi
- Physical review. E, Statistical, nonlinear, and…
- 2009

We describe a method for evolving the projected Gross-Pitaevskii equation (PGPE) for an interacting Bose gas in a harmonic-oscillator potential, with the inclusion of a long-range dipolar interaction. The central difficulty in solving this equation is the requirement that the field is restricted to a small set of prescribed modes that constitute the… (More)

- M T Reeves, T P Billam, B P Anderson, A S Bradley
- Physical review letters
- 2015

The Reynolds number provides a characterization of the transition to turbulent flow, with wide application in classical fluid dynamics. Identifying such a parameter in superfluid systems is challenging due to their fundamentally inviscid nature. Performing a systematic study of superfluid cylinder wakes in two dimensions, we observe dynamical similarity of… (More)

- T W Neely, E C Samson, A S Bradley, M J Davis, B P Anderson
- Physical review letters
- 2010

We report experimental observations and numerical simulations of the formation, dynamics, and lifetimes of single and multiply charged quantized vortex dipoles in highly oblate dilute-gas Bose-Einstein condensates (BECs). We nucleate pairs of vortices of opposite charge (vortex dipoles) by forcing superfluid flow around a repulsive Gaussian obstacle within… (More)

1 Phase transitions are ubiquitous in nature, and can be arranged into universality classes such that systems having unrelated microscopic physics show identical scaling behaviour near the critical point. One prominent universal element of many continuous phase transitions is the spontaneous formation of topological defects during a quench through the… (More)

We develop a stochastic Gross-Pitaveskii theory suitable for the study of Bose-Einstein condensation in a rotating dilute Bose gas. The theory is used to model the dynamical and equilibrium properties of a rapidly rotating Bose gas quenched through the critical point for condensation, as in the experiment of Haljan et al. In contrast to stirring a… (More)

- M. K. Olsen, A. S. Bradley
- 2006

We examine the tripartite entanglement properties of an optical system using interlinked ͑2͒ interactions, recently studied experimentally in terms of its phase-matching properties by Bondani et al. ͓Opt. Express 14, 21, 9838 ͑2006͔͒. We show that the system produces output modes at three distinct frequencies which are genuinely tripartite entangled, and… (More)

- Shih-Wei Su, Shih-Chuan Gou, Ashton Bradley, Oleksandr Fialko, Joachim Brand
- Physical review letters
- 2013

Atomic Bose-Einstein condensates confined to a dual-ring trap support Josephson vortices as topologically stable defects in the relative phase. We propose a test of the scaling laws for defect formation by quenching a Bose gas to degeneracy in this geometry. Stochastic Gross-Pitaevskii simulations reveal a -1/4 power-law scaling of defect number with quench… (More)

We study conditions under which vortices in a highly oblate harmonically trapped Bose-Einstein condensate (BEC) can be stabilized due to pinning by a blue-detuned Gaussian laser beam, with particular emphasis on the potentially destabilizing effects of laser beam positioning within the BEC. Our approach involves theoretical and numerical exploration of… (More)

- T P Billam, M T Reeves, B P Anderson, A S Bradley
- Physical review letters
- 2014

Despite the prominence of Onsager's point-vortex model as a statistical description of 2D classical turbulence, a first-principles development of the model for a realistic superfluid has remained an open problem. Here we develop a mapping of a system of quantum vortices described by the homogeneous 2D Gross-Pitaevskii equation (GPE) to the point-vortex… (More)

The process of cascaded down-conversion and sum-frequency generation inside an optical cavity has been predicted to be a potential source of three-mode continuous-variable entanglement. When the cavity is pumped by two fields, the threshold properties have been analyzed, showing that these are more complicated than in well-known processes such as optical… (More)