65 citations · 287 across the 12 of their papers we have counts for
13 papers
Metrics and methods for a systematic comparison of fairness-aware machine learning algorithms
Gareth P. Jones, James M. Hickey, Pietro G. Di Stefano +3
Understanding and removing bias from the decisions made by machine learning models is essential to avoid discrimination against unprivileged groups. Despite recent progress in algo…
Fairness by Explicability and Adversarial SHAP Learning
James M. Hickey, Pietro G. Di Stefano, Vlasios Vasileiou
The ability to understand and trust the fairness of model predictions, particularly when considering the outcomes of unprivileged groups, is critical to the deployment and adoption…
Counterfactual fairness: removing direct effects through regularization
Pietro G. Di Stefano, James M. Hickey, Vlasios Vasileiou
Building machine learning models that are fair with respect to an unprivileged group is a topical problem. Modern fairness-aware algorithms often ignore causal effects and enforce…
Intermittency and dynamical Lee-Yang zeros of open quantum systems
James M. Hickey, Christian Flindt, Juan P. Garrahan
We use high-order cumulants to investigate the Lee-Yang zeros of generating functions of dynamical observables in open quantum systems. At long times the generating functions take…
Signatures of many-body localisation in a system without disorder and the relation to a glass transition
James M. Hickey, Sam Genway, Juan P. Garrahan
We study a quantum spin system with local bilinear interactions and without quenched disorder which seems to display characteristic signatures of a many-body localisation (MBL) tra…
Timescales, dynamical phase transitions and 3rd order phase transitions in the 1d anisotropic XY model
James M. Hickey
Recent research into time-integrated observables has revealed a special class of states which cap- ture the singular features of the generating functions of those observables, as e…
Cumulants of time-integrated observables of closed quantum systems and PT-symmetry, with an application to the quantum Ising chain
James M. Hickey, Emanuele Levi, Juan P. Garrahan
We study the connection between the cumulants of a time-integrated observable of a quantum system and the PT-symmetry properties of the non-Hermitian deformation of the Hamiltonian…
Fluctuation Theorems and the Generalised Gibbs Ensemble in Integrable Systems
James M. Hickey, Sam Genway
We derive fluctuation relations for a many-body quantum system prepared in a Generalised Gibbs Ensemble subject to a general nonequilibrium protocol. By considering isolated integr…
Dynamical phase transitions, time-integrated observables and geometry of states
James M. Hickey, Sam Genway, Juan P. Garrahan
We show that there exist dynamical phase transitions (DPTs), as defined in [Phys. Rev. Lett. 110 135704 (2013)], in the transverse-field Ising model (TFIM) away from the static qua…
Trajectory phase transitions and dynamical Lee-Yang zeros of the Glauber-Ising chain
James M. Hickey, Christian Flindt, Juan P. Garrahan
We examine the generating function of the time-integrated energy for the one-dimensional Glauber-Ising model. At long times, the generating function takes on a large-deviation form…
Dynamical Phases in the Full Counting Statistics of the Resonant-Level Model
Sam Genway, James M. Hickey, Juan P. Garrahan +1
We present a thermodynamic formalism to study the full counting statistics (FCS) of charge transport through a quantum dot coupled to two leads in the resonant-level model. We show…
Time-integrated observables as order parameters for dynamical phase transitions in closed quantum systems
James M. Hickey, Sam Genway, Igor Lesanovsky +1
The dynamical behaviour of many-body systems is often richer than what can be anticipated from their static properties. Here we show that in closed quantum systems this becomes evi…
Thermodynamics of Quadrature Trajectories in Open Quantum Systems
James M. Hickey, Sam Genway, Igor Lesanovsky +1
We apply a large-deviation method to study the diffusive trajectories of the quadrature operators of light within a reservoir connected to dissipative quantum systems. We formulate…