A 12-CNOT Double Qubit Excitation Gate
A preprint on arXiv describes a circuit construction for a double qubit excitation gate that requires 12 CNOT gates. The operation is relevant to fermionic simulations and could be used in unitary coupled cluster ansätze for quantum chemistry.
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What this could mean
- 0–2 yearsPlausible
Near-term quantum chemistry calculations could incorporate this decomposition to reduce CNOT count and noise in VQE circuits for small molecules.
Double excitation operators are a core cost in UCC-type ansätze; a fixed 12-CNOT construction allows direct compilation onto existing superconducting or trapped-ion hardware without additional search or optimization.
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