Superconducting Resonator IDs Using Shorted Josephson Junctions
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Solution Overview
Problem
There is a need for non-volatile memory solutions compatible with superconducting chips operated at cryogenic temperatures, as existing technologies are scarce and cannot efficiently distribute workloads across networks of such chips.
Innovation Solution
The development of a superconducting chip with resonant units having Josephson junctions, where some junctions are shorted to create distinct resonant frequencies, allowing for non-volatile identification using microwave circuitry, enabling unique identification of each chip within a network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-volatile memory is added to superconducting chips for identification, then chip functionality and network capability are improved, but chip area and device complexity increase
Solution Approach 1:
The patent combines the non-volatile memory function with the existing superconducting resonant circuit by making the resonant unit itself serve as the memory element. The Josephson junctions in the resonant units are configured to have different resonant frequencies based on their shorted/unshorted state, encoding binary information directly in the frequency domain. This integration eliminates the need for separate memory structures, thereby improving chip identification capability without proportionally increasing chip area.
2Adaptability or versatility
If non-volatile memory is added to superconducting chips for identification, then chip functionality and network capability are improved, but device complexity increases
Solution Approach 1:
The resonant units serve multiple functions: they act as both the identification memory elements and as functional components of the superconducting quantum circuit. The same Josephson junctions that define the quantum circuit behavior also encode the identification bits through their shorted/unshorted configuration. This multi-functionality reduces overall device complexity by eliminating redundant components and simplifying the chip architecture.
3Reliability
If resonant units with shorted Josephson junctions are used for identification, then non-volatile identification is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary action by configuring the shorted/unshorted state of Josephson junctions during the manufacturing process before the chip is deployed. This allows the identification pattern to be established once during fabrication, ensuring reliable and persistent identification. The shorting process is performed as a deliberate manufacturing step rather than requiring precise control during operation, thereby reducing operational manufacturing precision requirements while maintaining reliable identification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a method for uniquely identifying superconducting chips in situ at cryogenic temperatures, using the same equipment as typical superconducting qubit chips, and allows for programmable bits that can be read out, minimizing chip real estate and ensuring compatibility with quantum computing environments.
Implementation Method 1
Josephson junctions in the resonant units. One or more of the Josephson junctions have a shorted tunnel barrier
Implementation Method 2
resonant units having resonant frequencies
Data Source
AI summary
A technique relates to a superconducting chip. Resonant units have resonant frequencies, and the resonant units are configured as superconducting resonators. Josephson junctions are in the resonant units, and one or more of the Josephson junctions have a shorted tunnel barrier.