Introducing the “multi-core” NISQ model
We outline details on the gate sequence, measurement scheme, and relevant error-mitigation techniques implement a Hubbard model variational quantum eigensolver on a NISQ platform. We perform resource estimation for both silicon spin qubits and superconducting qubits for a 50-qubit simulation, which cannot be solved exactly via classical means, and find similar results. TWhen searching for the ground state, we need a few days for one gradient-descent iteration, which is impractical. This can be reduced to around 10 min if we distribute our task among hundreds of quantum-processing units, such as could be provided in a ‘multi-core’ NISQ architecture.