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Google patents digital method to simplify quantum computer wiring

Patent drawing
Patent drawing from the official filing.

Google describes a system that sends control instructions to quantum bits (qubits) using a single digital data stream instead of multiple separate wires. Decoders split this stream to tell specific qubit controllers which operations to perform, such as running calculations or reading results.

Why it mattersThis approach could make quantum computers smaller and easier to manage by reducing the number of physical cables needed to reach the ultra-cold core.

In the filing’s own words

Digital demultiplexing techniques for quantum computing applications are described. A digital signal line provides control inputs to a plurality of decoders via a digital bitstream. The decoders each demultiplex (e.g., time-demultiplex) a portion of the digital bitstream and identify a control operation to perform on a qubit based on their respective portions of the bitstream. A qubit controller may be operated in accordance with the indicated control operation to control a qubit, which may include performing various control operations such as single-qubit gates, two-qubit gates, or readout operations. Such a configuration may reduce the footprint and thermal load of cables routing signals into the cryogenic stage, and thereby reduce circuit complexity, power needs, and/or footprint of the control system.

What exactly they claim (claim 1)

1. A system comprising: a plurality of qubits including a first qubit; a qubit controller coupled to the first qubit, the qubit controller configured to receive a digital value and perform one of a plurality of control operations, selected according to the digital value, on the first qubit; a digital signal line; and a decoder coupled to the qubit controller and to the digital signal line, the decoder configured to demultiplex a portion of a digital bitstream transmitted along the digital signal line, and to send the digital value to the qubit controller based on the portion of the digital bitstream demultiplexed from the digital bitstream.

Facts

Company
Google (Google LLC)
Official title
TECHNIQUES FOR DIGITAL CONTROL OF SUPERCONDUCTING QUBITS
Publication number
US20260330281A1
Application number
19183584
Filed
Apr 18, 2025
Published
Oct 22, 2026
Inventors
2
Claims
27

Classified under

G06N 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.