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Quantum circuit compilation for fermionic excitations using the Jordan-Wigner mapping
Renata Wong·January 12, 2026
Quantum Physics
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Abstract
This note bridges the gap between theoretical second quantization and practical quantum hardware by detailing the Jordan-Wigner mapping for the Unitary Coupled Cluster Singles and Doubles (UCCSD) ansatz. Using the hydrogen molecule in a minimal basis as a case study, we explicitly derive the Pauli strings required for single and double excitations. Additionally, we discuss the translation of these operators into quantum circuits, with a focus on implementation nuances such as the difference between mathematical rotations and physical gates like the $\sqrt{X}$ (SX) gate.