26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Session

AIP QST: Quantum fluids & Bose-Einstein condensates

QST

10 Dec 2026, 11:00

Belinda Hutchinson Building (The University of Sydney )

626. Dark-state phase transition to a dark soliton in a dissipative Bose–Hubbard chain

Prof. Matthew Davis (University of Queensland)

10/12/2026, 11:00

AIP | Quantum Science and Technology (QST)

Contributed Oral

Novel nonequilibrium states of superfluids can be engineered by the controlled application of dissipation. In this work we show that a Bose–Hubbard model with local loss exhibits a first-order dark-state phase transition between a dark soliton and a uniform superfluid. Semiclassical simulations and stability analysis reveal that the soliton acts as a many‑body dark state, whose suppressed...

218. Applicability of conventional hydrodynamics to finite-temperature 1D Bose gases

Carsten Dittrich (University of Queensland)

10/12/2026, 11:15

AIP | Quantum Science and Technology (QST)

Contributed Oral

One-dimensional Bose gases with repulsive contact interactions provide a paradigmatic example of an integrable quantum many-body system. Realized experimentally with ultracold atoms and described theoretically by the exactly solvable Lieb–Liniger model, they have become an important platform for studying non-equilibrium quantum dynamics.

Despite the exact solvability of the Lieb–Liniger...

628. Creating edge states of vortex lattices in Bose-Einstein condensates

Mason Clarke (the University of Queensland)

10/12/2026, 11:30

AIP | Quantum Science and Technology (QST)

Contributed Oral

Edge states are excitations in many-body systems that are spatially localised at the boundary. They exhibit desirable properties such as dissipationless transport and robustness against disorder. These features stem from a topological origin, and are central to phenomena like the quantum Hall effect and topological insulators.

In a rotating planar Bose–Einstein condensates (BECs), the...

429. Geometry-Enhanced Lifetime of Bogoliubov Modes in Ring Bose–Einstein Condensates

Lachlan Miller

10/12/2026, 11:45

AIP | Quantum Science and Technology (QST)

Contributed Oral

We use the Gross–Pitaevskii equation to study the evolution of Bogoliubov excitations in a Bose–Einstein condensate with arbitrary one- and two-dimensional geometries. By numerically solving the time-dependent equation in experimentally relevant trapping potentials, we analyze how boundary conditions and density inhomogeneities modify the excitation spectrum and nonlinear mode dynamics. In a...

652. A Universal Description of the Critical Vortex Nucleation Velocity in Superfluid Flow

Maarten Christenhusz (University of Queensland)

10/12/2026, 12:00

AIP | Quantum Science and Technology (QST)

Contributed Oral

Superfluids exhibit frictionless flow past an obstacle below a critical velocity. Beyond this threshold, dissipation emerges through the nucleation of quantised vortices, opening the pathway to quantum turbulence. Although the critical velocity has been studied extensively, its dependence on obstacle shape is still not fully understood. We investigate whether a universal geometric description...

430. Two-Photon Quantum Polarimetry with Entanglement for Tissue-like Scattering Media

Andrey A. Sukhorukov (Australian National University, Australia)

10/12/2026, 12:15

ANZOS | Quantum and Atom Optics (ANZCOP QAO)

Contributed Oral

Polarimetry is a fundamental optical characterisation technique that reveals material-specific properties such as internal structure, molecular composition, and anisotropy. Whereas classical approaches rely on intensity averages, quantum polarimetry enables phase-sensitive measurements at ultra-low light levels, an advantage for fragile or photosensitive samples. Additionally, quantum...