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Google patents method to fix specific quantum bits based on error scores

This filing describes a way to check the health of a quantum computer's individual bits, or qubits. It calculates a score for each qubit by looking at its own performance and how it interacts with nearby qubits, then automatically adjusts settings for any qubit that scores too high.

Why it mattersIt offers a targeted approach to maintaining quantum hardware, which is essential for making these experimental computers reliable enough for practical use.

In the filing’s own words

Methods, systems, and apparatus for targeted quantum processor recalibration. In one aspect, a method includes obtaining normalized values of quantum processor system metrics, wherein the system metrics comprise single qubit metrics and two qubit metrics; determining, for each single qubit metric, an effective single qubit metric, wherein the effective single qubit metric comprises the single qubit metric and a sum of two qubit metrics corresponding to pairs of qubits that include a same qubit as the single qubit metric; computing, using the normalized values of the system metrics, values of the effective single qubit metrics; combining, for each qubit referenced by single qubit metrics in the system metrics, effective single qubit metrics that correspond to the qubit to obtain a score for the qubit; and causing recalibration of operating parameters of qubits with scores that exceed a predetermined outlier threshold.

What exactly they claim (claim 1)

1. A computer-implemented method comprising: obtaining a set of normalized values of system metrics for a quantum processor, wherein the system metrics comprise single qubit metrics that correspond to respective qubits and two qubit metrics that correspond to respective pairs of qubits; determining, for each single qubit metric, an effective single qubit metric, wherein the effective single qubit metric comprises the single qubit metric and a sum of two qubit metrics corresponding to pairs of qubits that include a same qubit as the single qubit metric; computing, using the normalized values of the system metrics, values of the effective single qubit metrics; combining, for each qubit referenced by single qubit metrics in the system metrics, effective single qubit metrics that correspond to the qubit to obtain a score for the qubit; and causing recalibration of operating parameters of qubits with scores that exceed a predetermined outlier threshold.

Facts

Company
Google (Google LLC)
Official title
METRIC BASED QUANTUM PROCESSOR RE-CALIBRATION
Publication number
US20260289364A1
Application number
19473230
Filed
Apr 7, 2023
Published
Sep 24, 2026
Inventors
2
Claims
15

Classified under

G06N 10/20 Physics & computingG06N 10/40 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.