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Google patents method to tune connections between quantum bits

This patent describes a system for quantum computers that uses adjustable circuits to link pairs of quantum bits, known as fluxonium qubits. It works by sending specific magnetic pulses to these links to control how the bits interact during calculations.

Why it mattersThis is interesting to tech enthusiasts because it details a specific hardware technique for improving the precision of quantum processors, which are still in the early stages of development.

In the filing’s own words

An apparatus comprises: an array of coupled quantum elements in a housing configured to provide a low-temperature environment, where at least one of the quantum elements comprises: a first fluxonium qubit circuit, and a qubit coupling circuit configured to couple the first fluxonium qubit circuit to a second fluxonium qubit circuit, where the qubit coupling circuit comprises a tunable superconducting circuit that has at least one tunable characteristic; and a control module configured to apply magnetic flux pulses to quantum elements in the array of coupled quantum elements based at least in part on digital control signals received from a digital signal interface providing the digital control signals into the housing.

What exactly they claim (claim 1)

1. A method for performing at least one quantum gate operation on a quantum processor, the method comprising: applying a first magnetic field flux pulse through a first inductive loop associated with a first superconducting circuit; and where, during a portion of the first magnetic field flux pulse, a first energy associated with a first multi-qubit state comprising an excited state of the first superconducting circuit and a state of a second superconducting circuit is substantially equal to a second energy associated with a second multi-qubit state comprising a ground state of the first superconducting circuit and an excited state of the second superconducting circuit.

Facts

Company
Google (Google LLC)
Official title
Managing coupling in a quantum computing system
Patent number
US12748997B2
Application number
18477592
Filed
Sep 29, 2023
Granted
Sep 29, 2026
Inventors
3
Claims
47

Classified under

G06N 10/40 Physics & computingH10N 60/805 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.