Enhanced analogue quantum computation with a logically-encoded XX gadget
Abstract
The introduction of two-body XX interactions has been shown to improve the performance of quantum annealing in solving certain combinatorial optimisation problems and would enable the simulation of a broader class of many-body Hamiltonians. Due to experimental constraints, such interactions are typically not natively available on analogue quantum devices. To overcome this limitation we introduce the truss gadget. This is an exact construction that generates two-body XX interactions using only one-body X and Z fields and two-body ZZ interactions which are readily accessible on, for instance, superconducting quantum annealers. We experimentally validate the construction by reproducing the dynamics of a target XX Hamiltonian on a trapped-ion quantum processor. We then apply the gadget to an illustrative set of instances of the weighted maximum-independent-set problem on a superconducting quantum annealer. We empirically determine an approximate thousand-fold improvement in the probability of finding a state close to the ground state for these instances, over implementation without an XX interaction.
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BibTeX
@misc{banks2026enhanced,
title = {{Enhanced analogue quantum computation with a logically-encoded XX gadget}},
author = {Robert J. Banks and Natasha Feinstein and Roopayan Ghosh and Sebastian Schulz and Kristel Michielsen and Sougato Bose and P. A. Warburton},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.13845},
eprint = {2610.13845},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.13845},
}
RIS
TY - UNPB
TI - Enhanced analogue quantum computation with a logically-encoded XX gadget
AU - Robert J. Banks
AU - Natasha Feinstein
AU - Roopayan Ghosh
AU - Sebastian Schulz
AU - Kristel Michielsen
AU - Sougato Bose
AU - P. A. Warburton
PY - 2026
DA - 2026/10/09
PB - arXiv
DO - 10.48550/arxiv.2610.13845
UR - https://arxiv.org/abs/2610.13845
AB - The introduction of two-body XX interactions has been shown to improve the performance of quantum annealing in solving certain combinatorial optimisation problems and would enable the simulation of a broader class of many-body Hamiltonians. Due to experimental constraints, such interactions are typically not natively available on analogue quantum devices. To overcome this limitation we introduce the truss gadget. This is an exact construction that generates two-body XX interactions using only one-body X and Z fields and two-body ZZ interactions which are readily accessible on, for instance, superconducting quantum annealers. We experimentally validate the construction by reproducing the dynamics of a target XX Hamiltonian on a trapped-ion quantum processor. We then apply the gadget to an illustrative set of instances of the weighted maximum-independent-set problem on a superconducting quantum annealer. We empirically determine an approximate thousand-fold improvement in the probability of finding a state close to the ground state for these instances, over implementation without an XX interaction.
ER -