Method and system for quantum error mitigation

Abstract

Some embodiments relate to a method and system for quantum error mitigation (QEM) of noise in a quantum system configured to execute a quantum circuit, wherein the noise induces an error on a noise-free evolution U of the quantum circuit. The method comprises: defining a noisy evolution operator, , associated with a noisy evolution of the quantum circuit, operator, , configured to execute a Hamiltonian drive H(t) which generates the noise-free evolution U in the absence of noise; defining a corresponding inverse noisy evolution operator, , being a pulse inverse operator configured to execute a corresponding inverse Hamiltonian drive HI(t); and creating an operator , which is an approximate square of a noise channel associated with the operator , said operator representing execution of the Hamiltonian drive H(t) followed by execution of the corresponding inverse Hamiltonian drive HI(t) thereby enabling error mitigation of noise in the quantum system.

Dependencies are inferred from the claim text.