4 papers
PyMatching: A Python package for decoding quantum codes with minimum-weight perfect matching
Oscar Higgott
This paper introduces PyMatching, a fast open-source Python package for decoding quantum error-correcting codes with the minimum-weight perfect matching (MWPM) algorithm. PyMatchin…
Subsystem codes with high thresholds by gauge fixing and reduced qubit overhead
Oscar Higgott, Nikolas P. Breuckmann
We introduce a technique that uses gauge fixing to significantly improve the quantum error correcting performance of subsystem codes. By changing the order in which check operators…
Variational Quantum Computation of Excited States
Oscar Higgott, Daochen Wang, Stephen Brierley
The calculation of excited state energies of electronic structure Hamiltonians has many important applications, such as the calculation of optical spectra and reaction rates. While…
Accelerated Variational Quantum Eigensolver
Daochen Wang, Oscar Higgott, Stephen Brierley
The problem of finding the ground state energy of a Hamiltonian using a quantum computer is currently solved using either the quantum phase estimation (QPE) or variational quantum…