Patent ID: 11894860
Assignee: GOOGLE LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. An apparatus comprising:
quantum hardware; and
one or more classical processors;
wherein the apparatus is configured to perform operations for correcting a result of a quantum computation, the operations comprising:
selecting, by the one or more classical processors, a quantum error correcting code to perform the quantum computation, wherein the quantum error correcting code is defined by a respective set of stabilizer generators;
determining, by the one or more classical processors, a set of symmetry operators, comprising:
selecting a subset of the set of stabilizer generators, the subset comprising a plurality of stabilizer generators;
determining, for each stabilizer generator in the selected subset, a sum between an identity operator and the stabilizer generator; and
multiplying the determined sums together to form a summation of terms, wherein each term in the summation is equal to a respective symmetry operator;

measuring, using the quantum hardware, a projective correction of a physical observable over an output quantum state of the quantum computation using the determined set of symmetry operators, wherein the physical observable corresponds to the result of the quantum computation; and
determining, by the one or more classical processors, a corrected result of the quantum computation using the measured projective correction of the physical observable.