167 citations · 621 across the 14 of their papers we have counts for
14 papers
Thermometry of simulated Bose--Einstein condensates using machine learning
Jack Griffiths, Steven A. Wrathmall, Simon A. Gardiner
Precise determination of thermodynamic parameters in ultracold Bose gases remains challenging due to the destructive nature of conventional measurement techniques and inherent expe…
Solving physics-based initial value problems with unsupervised machine learning
Jack Griffiths, Steven A. Wrathmall, Simon A. Gardiner
Initial value problems -- a system of ordinary differential equations and corresponding initial conditions -- can be used to describe many physical phenomena including those arise…
Spin-orbit coupled interferometry with ring-trapped Bose--Einstein condensates
John L. Helm, Thomas P. Billam, Ana Rakonjac +2
We propose a method of atom-interferometry using a spinor Bose-Einstein condensate (BEC) with a time-varying magnetic field acting as a coherent beam-splitter. Our protocol creates…
Cooperative eigenmodes and scattering in 1D atomic arrays
R. J. Bettles, S. A. Gardiner, C. S. Adams
Collective coupling between dipoles can dramatically modify the optical response of a medium. Such effects depend strongly on the geometry of the medium and the polarization of the…
Excitation of knotted vortex lines in matter waves
F. Maucher, S. A. Gardiner, I. G. Hughes
We study the creation of knotted ultracold matter waves in Bose-Einstein condensates via coherent two-photon Raman transitions with a level configuration. The Raman transition…
Measuring the disorder of vortex lattices in a Bose-Einstein condensate
A. Rakonjac, A. L. Marchant, T. P. Billam +4
We report observations of the formation and subsequent decay of a vortex lattice in a Bose-Einstein condensate confined in a hybrid optical-magnetic trap. Vortices are induced by r…
Quantum reflection of bright solitary matter-waves from a narrow attractive potential
A. L. Marchant, T. P. Billam, M. M. H. Yu +6
We report the observation of quantum reflection from a narrow, attractive, potential using bright solitary matter-waves formed from a 85Rb Bose-Einstein condensate. We create narro…
Sagnac Interferometry Using Bright Matter-Wave Solitons
J. L. Helm, S. L. Cornish, S. A. Gardiner
We use an effective one-dimensional Gross-Pitaevskii equation to study bright matter-wave solitons held in a tightly confining toroidal trapping potential, in a rotating frame of r…
Splitting bright matter-wave solitons on narrow potential barriers: quantum to classical transition and applications to interferometry
J. L. Helm, S. J. Rooney, Christoph Weiss +1
We study bright solitons in the Gross-Pitaevskii equation as they are split and recombined in a low energy system. We present new analytic results determining the general region in…
Number-Conserving Approaches for Atomic Bose-Einstein Condensates: An Overview
S. A. Gardiner, T. P. Billam
Assuming the existence of a Bose-Einstein condensate composed of the majority of a sample of ultracold, trapped atoms, perturbative treatments to incorporate the non-condensate fra…
Variational determination of approximate bright matter-wave soliton solutions in anisotropic traps
T. P. Billam, S. A. Wrathmall, S. A. Gardiner
We consider the ground state of an attractively-interacting atomic Bose-Einstein condensate in a prolate, cylindrically symmetric harmonic trap. If a true quasi-one-dimensional lim…
Coherence and Instability in a Driven Bose-Einstein Condensate: A Fully Dynamical Number-Conserving Approach
T. P. Billam, S. A. Gardiner
We consider a Bose-Einstein condensate driven by periodic delta-kicks. In contrast to first-order descriptions, which predict rapid, unbounded growth of the noncondensate in resona…
Cavity assisted quasiparticle damping in a Bose-Einstein condensate
S. A. Gardiner, K. M. Gheri, P. Zoller
We consider an atomic Bose-Einstein condensate held within an optical cavity and interacting with laser fields. We show how the interaction of the cavity mode with the condensate c…
Quantum chaos in an ion trap: the delta-kicked harmonic oscillator
S. A. Gardiner, J. I. Cirac, P. Zoller
We propose an experimental configuration, within an ion trap, by which a quantum mechanical delta-kicked harmonic oscillator could be realized, and investigated. We show how to dir…