PreprintarXiv licencearXiv
Coupling between molecular exchange qubits
Abstract
Spin triangles are promising systems for defining and manipulating scalar degrees of freedom, such as chirality, partial spin sums, or combinations between the two. Here we extend this analysis to dimers formed by pairs of spin triangles, coupled by exchange or dipolar interactions. We show that the weak-coupling limit warrants the introduction of an effective two-qubit picture, and derive the expressions of the related Hamiltonians as a function of the underlying physical interaction between the triangles. We benchmark this two-qubit Hamiltonian against the microscopic one, and discuss the observable effects of the inter-triangle coupling on the spin-electric transitions between states with different chiralities or partial-spin sums.
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BibTeX
@misc{troiani2026coupling,
title = {{Coupling between molecular exchange qubits}},
author = {Filippo Troiani and Jason S. R. McCoombs and Athanassios K. Boudalis},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08058},
eprint = {2611.08058},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08058},
}
RIS
TY - UNPB
TI - Coupling between molecular exchange qubits
AU - Filippo Troiani
AU - Jason S. R. McCoombs
AU - Athanassios K. Boudalis
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.08058
UR - https://arxiv.org/abs/2611.08058
AB - Spin triangles are promising systems for defining and manipulating scalar degrees of freedom, such as chirality, partial spin sums, or combinations between the two. Here we extend this analysis to dimers formed by pairs of spin triangles, coupled by exchange or dipolar interactions. We show that the weak-coupling limit warrants the introduction of an effective two-qubit picture, and derive the expressions of the related Hamiltonians as a function of the underlying physical interaction between the triangles. We benchmark this two-qubit Hamiltonian against the microscopic one, and discuss the observable effects of the inter-triangle coupling on the spin-electric transitions between states with different chiralities or partial-spin sums.
ER -