collaborators

7 papers

quant-ph2026

Quantum Approximate Optimization via Noise-Directed Adaptive Warm-Starting

Filip B. Maciejewski, Stuart Hadfield, Oscar Wallis +5

Progress towards a quantum advantage using known heuristic methods for combinatorial optimization is impeded by hardware noise and limited qubit count. Here, we propose a noise-awa…

quant-ph2026

Quench Spectroscopy of Magnetic Excitations on a Superconducting Quantum Processor

D. A. Millar, G. W. Pennington, N. T. M. Siow +5

The elementary excitation spectrum of a many-body quantum system encodes many key properties, including phenomena as diverse as transport, thermalisation and ground state structure…

quant-ph2026

Setting angles in quantum approximate optimization at utility-scale

Maosheng Guo, Joel Jurado Diaz, Anurag Ramesh +16

The quantum approximate optimization algorithm (QAOA) is a powerful heuristic that seeks to solve combinatorial optimization problems using quantum hardware and classical optimizat…

quant-ph2026

Preparing 100-qubit symmetry-protected topological order on a digital quantum computer

George Pennington, Kevin C. Smith, James R. Garrison +3

Symmetry-protected topological (SPT) phases extend the Landau paradigm of quantum matter by admitting distinct symmetry-preserving phases that lack any local order parameter. Demon…

quant-ph2025

Boosting Sparsity in Graph Decompositions with QAOA Sampling

George Pennington, Naeimeh Mohseni, Oscar Wallis +5

We study the problem of decomposing a graph into a weighted sum of a small number of matchings, a task that arises in network resource allocation problems such as peer-to-peer ener…

quant-ph2025

Variational preparation of normal matrix product states on quantum computers

Ben Jaderberg, George Pennington, Kate V. Marshall +6

Preparing matrix product states (MPSs) on quantum computers is an essential routine in the simulation of many-body physics. However, widely-used schemes based on staircase circuits…