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Google patents method to fix errors in quantum circuits

Patent drawing
Patent drawing from the official filing.

Google describes a technique for quantum computers that adds specific correction steps to a circuit to cancel out unwanted movements of quantum bits. The system identifies where these corrections are needed and adjusts their strength, allowing multiple corrections to be tuned at the same time to improve accuracy.

Why it mattersThis is a routine improvement in quantum error correction that helps make quantum calculations more reliable, but it does not impact everyday devices.

In the filing’s own words

Methods, systems, and apparatus for inserting and calibrating compensation operations in quantum circuits. One or more operations in a quantum circuit that each violate a generalized commutation relation with a compensation operation are identified, where the compensation operation counteracts uncontrolled qubit rotations. The compensation operation is inserted directly before each of the one or more operations in the quantum circuit that violate the commutation relation with the compensation operation. Rotation angles of the compensation operations inserted into the quantum circuit are then calibrated. Rotation angles in a group of rotation angles that have non-overlapping sets of detectors can be calibrated in parallel.

What exactly they claim (claim 1)

1. A method performed by a quantum computing device, the method comprising: identifying one or more operations in a quantum circuit that each violate a commutation relation with a compensation operation, wherein the compensation operation counteracts uncontrolled qubit rotations; inserting the compensation operation directly before each of the one or more operations in the quantum circuit that violate the commutation relation with the compensation operation; and calibrating rotation angles of the compensation operations inserted into the quantum circuit.

Facts

Company
Google (Google LLC)
Official title
INSERTING AND CALIBRATING COMPENSATION PHASES IN QUANTUM CIRCUITS
Publication number
US20260330274A1
Application number
19071221
Filed
Mar 5, 2025
Published
Oct 22, 2026
Inventors
3
Claims
21

Classified under

G06N 10/20 Physics & computingG06N 10/70 Physics & computing
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.