Researchers map noise on up to 92 qubits with new learning method

Researchers have successfully mapped noise characteristics with experiments up to 92 qubits and validation on up to 21 qubits (GHZ state). The team, spanning IBM Quantum research centers in Research Triangle Park, San Jose, and Yorktown Heights, as well as the University of Chicago and École Polytechnique Fédérale de Lausanne, demonstrated that previously considered limitations, "unlearnable (gauge) degrees of freedom", do not hinder accurate predictions of noisy quantum dynamics or error mitigation when using learnable parameters. This work utilizes gate set Pauli noise learning to characterize and mitigate noise across a complete gate set, from state preparation to multi-qubit operations, while a consistent set of parameters reduces sampling overhead.…