Superconducting Chip Secure Identification via Josephson Junction Resonance
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Solution Overview
Problem
Current methods for identifying superconducting chips in quantum computing networks lack security and are prone to counterfeiting, as they rely on non-volatile random access memory that can be read out or de-layered, making it difficult to ensure authenticity and uniqueness.
Innovation Solution
A superconducting chip with resonant units featuring Josephson junctions, where variations in the junctions during fabrication provide a unique and unpredictable sequence of resonant frequencies, used for secure identification, which can be read out using microwave circuitry and compared against a stored reference to verify authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-volatile random access memory is used for chip identification, then identification can be stored and read out, but the identification can be de-layered and counterfeited
Solution Approach 1:
The patent replaces traditional electronic memory-based identification systems with a physics-based resonant frequency system. Each chip contains resonant units with Josephson junctions that produce unique resonant frequencies based on uncontrollable manufacturing variations. This physical resonance approach substitutes for programmable memory, making identification inherently tied to the chip's physical structure and impossible to counterfeit without replicating the exact physical variations.
Solution Approach 2:
The patent exploits parameter variations in Josephson junctions during fabrication to create unique resonant frequencies. The uncontrollable variations in junction parameters (such as critical current, inductance, or capacitance) directly translate to unique resonant frequency signatures for each chip. This parameter-based identification approach ensures that no two chips have identical identification, and the variations cannot be precisely replicated.
2Reliability
If resonant units with Josephson junctions are used for identification, then unique and secure identification is achieved, but device complexity increases
Solution Approach 1:
The resonant units with Josephson junctions serve multiple functions: they provide secure identification through unique resonant frequencies, while also being compatible with existing superconducting quantum computing architectures. The same Josephson junction technology used for quantum bit operations is leveraged for identification purposes, eliminating the need for separate identification hardware and reducing overall system complexity.
Solution Approach 2:
The chip's own manufacturing variations, which would normally be considered defects or sources of noise, are harnessed to automatically generate unique identification signatures. Each chip self-identifies through its inherent physical characteristics without requiring external programming or additional identification components. The uncontrollable variations in Josephson junction fabrication naturally produce the unique resonant frequencies needed for 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
The method provides a secure and unique identification for each chip, making counterfeiting prohibitively costly by leveraging the uncontrollable variability in Josephson junctions, ensuring accurate authentication within a predefined margin.
Implementation Method 1
resonant units each including a Josephson junction. The resonant units have resonant frequencies whose differences are based on a variation in the Josephson junction
Implementation Method 2
The resonant units have resonant frequencies whose differences are based on a variation in the Josephson junction
Data Source
AI summary
A technique relates to a superconducting chip. Resonant units each include a Josephson junction. The resonant units have resonant frequencies whose differences are based on a variation in the Josephson junction. A transmission medium is coupled to the resonant units, and the transmission medium is configured to output a sequence of the resonant frequencies as an identification of the chip.