Universally Robust Quantum Control @DIASDublin

Uploaded August 2025 | Updated September 2026, 2 weeks ago

Speaker: Anthony Kiely (University College Dublin)
Abstract: We study the robustness of the evolution of a quantum system against small uncontrolled variations in parameters in the Hamiltonian. We show that the fidelity susceptibility, which quantifies the perturbative error to leading order, can be expressed in superoperator form and use this to derive control pulses which are robust to any class of systematic unknown errors. The proposed optimal control protocol is equivalent to searching for a sequence of unitaries that mimics the first-order moments of the Haar distribution, i.e. it constitutes a 1-design. We highlight the power of our results for error resistant single- and two-qubit gates.

Lorentzian Quasicrystals and the Irrationality of Spacetime

$Q-Series and Modularity Speaker Werner Nahm (DIAS) Abstract: Special q-series turn up in several areas of mathematics and mathematical physics, in particular as knot polynomials in Chern-Simons theory and as partition functions in conformal field theory. The terms of the series are fractions with a power of q in the numerator and Pochhammer symbols in the denominator. The modular (or quantum modular) nature of these series becomes manifest in their behavior near roots of unity. The latter can be studied by Lefshetz thimbles. In contrast to the usual situation, these thimbles intersect, which leads to intricate combinatorics.$

Unitarity, Unimodular Tme and Resolution of Singularities

A day in the life: Celtic Studies! (Part 1)

Summer Students - Final Presentations : Part 2

The Status of Women in Early Irish Law - Fergus Kelly

The Noncommutative Geometry of the Standard Quantum Sphere

Newgrange and JWST: Humanitys Enduring Quest to Understand the Universe