Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Hickey, James M."'
Autor:
Jones, Gareth P., Hickey, James M., Di Stefano, Pietro G., Dhanjal, Charanpal, Stoddart, Laura C., Vasileiou, Vlasios
Understanding and removing bias from the decisions made by machine learning models is essential to avoid discrimination against unprivileged groups. Despite recent progress in algorithmic fairness, there is still no clear answer as to which bias-miti
Externí odkaz:
http://arxiv.org/abs/2010.03986
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 of machine learning systems. SHAP values provide a unified framework
Externí odkaz:
http://arxiv.org/abs/2003.05330
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 fairness through modifications applicable to only a subset of machine
Externí odkaz:
http://arxiv.org/abs/2002.10774
Autor:
Hickey, James M.
This thesis investigates the dynamical properties of equilibrium and nonequilibrium systems, both quantum and classical, under the guise of a thermodynamic formalism. Large deviation functions associated with the generating functions of time-integrat
Externí odkaz:
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639892
Publikováno v:
Phys. Rev. E 90, 062128 (2014)
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 on a large deviation form with singularities of the associated cumulan
Externí odkaz:
http://arxiv.org/abs/1407.3963
Publikováno v:
Journal of Statistical Mechanics: Theory and Experiment 054047, (2016)
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) transition. From direct diagonalisation of small systems, we find a chang
Externí odkaz:
http://arxiv.org/abs/1405.5780
Autor:
Hickey, James M.
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 estimated by full counting statistics (FCS). In this work we extend the
Externí odkaz:
http://arxiv.org/abs/1403.5515
Publikováno v:
Phys. Rev. B 90, 094301 (2014)
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 from which the generating function of these cumulants is obtained. Th
Externí odkaz:
http://arxiv.org/abs/1403.4538
Autor:
Hickey, James M., Genway, Sam
Publikováno v:
Phys. Rev. E 90, 022107 (2014)
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 integrable systems, we find generalisations to the Tasaki-Crooks and Jarzyns
Externí odkaz:
http://arxiv.org/abs/1403.3542
Publikováno v:
Phys. Rev. B 89, 054301 (2014)
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 quantum critical points. We study a class of special states associated wi
Externí odkaz:
http://arxiv.org/abs/1309.1673