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Google patents method to fix quantum computer errors using symmetry

Patent drawing from the official filing.

Google has filed a patent application describing a technique to correct errors in quantum computations. The method uses specific symmetry operators derived from the quantum error-correcting code to measure and adjust the final result of a calculation.

Why it mattersThis is a specialized improvement in quantum error correction, a critical step for making quantum computers reliable enough for practical use.

In the filing’s own words

Methods, systems and apparatus for correcting a result of a quantum computation. In one aspect, a method includes selecting a quantum error correcting code for the quantum computation, wherein the quantum error correcting code is defined by multiple stabilizer generators; determining a set of symmetry operators, comprising: selecting a subset of the stabilizer generators, determining, for each selected stabilizer generator, 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 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 a corrected result of the quantum computation using the measured projective correction of the physical observable.

What exactly they claim (claim 1)

1. (canceled)

Facts

Company: Google (Google LLC)
Official title: DECODING ERRORS USING QUANTUM SUBSPACE EXPANSION
Publication number: US20260311029A1
Application number: 19054429
Filed: Feb 14, 2025
Published: Oct 8, 2026
Inventors: 3
Claims: 21

Classified under

G06N 10/70 Physics & computingG06N 10/00 Physics & computingH03M 13/1575 Electricity & electronics

Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.