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Sum rule for non-adiabatic geometric phases
Adam Fredriksson, Erik Sjöqvist·November 27, 2025·DOI: 10.1016/j.physleta.2026.131345
Quantum Physics
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Abstract
Berry monopoles always cancel when summing over a complete set of energy eigenstates. We demonstrate that analogous sum rules exist for geometric phases and their underlying 2-forms in non-adiabatic evolution. Our result has implications for qudit computation as it limits the types of gates that can be implemented by purely geometric means.