Error mitigation extends the computational reach of a noisy quantum processor

摘要: Quantum computation, a paradigm of computing that is completely different from classical methods, benefits theoretically proved speed-ups for certain problems and can be used to study the properties quantum systems1. Yet, because inherently fragile nature physical elements (qubits), achieving advantages over computation requires extremely low error rates qubit operations, as well substantial physical qubits, realize fault tolerance via correction2,3. However, recent theoretical work4,5 has shown accuracy (based on expectation values observables) enhanced through an extrapolation results collection experiments varying noise. Here we demonstrate this error mitigation protocol superconducting processor, enhancing its computational capability, with no additional hardware modifications. We apply mitigate errors in canonical single- two-qubit then extend application variational optimization6–8 Hamiltonians chemistry magnetism9. effectively suppression incoherent helps achieve otherwise inaccessible level solutions using our noisy processor. These mitigation techniques will enable substantial improvements capabilities near-term hardware. The computations noisy, systems by extrapolating various noise levels, without requiring