Josephson Parametric Coupler

The Josephson parametric coupler addresses challenges in quantum computing by providing high-fidelity qubit state measurements with improved bandwidth and reduced passive coupling, enhancing quantum computing capabilities.

JP7869265B2Active Publication Date: 2026-06-02GOOGLE LLC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
GOOGLE LLC
Filing Date
2024-07-11
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing quantum computing technologies face challenges in designing and implementing large-scale quantum architectures due to difficulties in controlling, programming, and maintaining quantum hardware, particularly in the amplification of qubit state measurements.

Method used

A Josephson parametric coupler is designed with an input port, output port, and a signal path containing sections with different passbands, coupled by a Josephson junction, which converts signals to different frequencies using a pump tone, and can be configured as a bandpass filter or amplifier, utilizing RF SQUIDs for enhanced parametric coupling.

Benefits of technology

The design provides high-fidelity state measurements of superconducting qubits with improved bandwidth and reduced passive coupling, enabling efficient amplification and frequency conversion for quantum computing applications.

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Abstract

To present a Josephson parametric device that includes an input port, an output port, and a signal path between the input port and the output port.SOLUTION: A signal path includes a first section coupled to an input port and having a first passband, a second section coupled to an output port and having a second passband, and a Josephson junction coupling element for parametric coupling between the first and second sections. The Josephson junction coupling element is coupled to and interposed between the first and second sections. The Josephson junction coupling element is configured such that the input port receives a first signal at a first frequency within the first passband, and in response to the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal to a second signal at a second frequency within the second passband.SELECTED DRAWING: Figure 1
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