Results of the Quantum Climate Challenge 2023 on CO2 Capture Materials
summary
Deloitte’s Quantum Climate Challenge 2023 benchmarks a VQE workflow against classical references to predict CO2 binding in a magnesium–CO2 MOF site, implemented as VQE on IBM Qiskit with both perfect‑qubit simulation and superconducting hardware. Active spaces of 4/8/12/16 active‑orbital reductions drive exponential growth in gate count; VQE follows the classical “Caskey” reference at 4–8 orbitals and reaches beyond CCSD accuracy trends as active space increases, but physical qubits deviate past eight qubits from noise and algorithmic design limits, so the prototype works small‑scale but fails to scale.
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