Josephson Junction Array Terahertz Laser for Cryogenic Data Links
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Solution Overview
Problem
Current technologies face challenges in establishing a direct data link between cryogenic circuits and room temperature electronics, which is essential for the widespread adoption of superconducting technology in sensing and communication applications, particularly in quantum computing.
Innovation Solution
A sub-micron-scale coherent terahertz (THz) laser is developed using a high-density array of high-temperature superconducting Josephson junctions, enabling a direct one-way link from superconducting to electro-optical circuitry, with the ability to modulate frequency and amplitude of THz laser emission using an on-chip superconducting circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electro-optical circuits and optical fiber technology are used for data egress, then a data link between cryogenic platforms and room temperature electronics is established, but device complexity and loss of energy increase
Solution Approach 1:
The patent introduces a terahertz laser as an intermediary device that converts electrical signals directly to terahertz radiation, serving as a mediator between superconducting circuits and electro-optical systems. This eliminates the need for complex cryogenic-compatible electro-optical circuits while maintaining data link functionality.
Solution Approach 2:
The patent replaces mechanical and complex electro-optical conversion systems with a direct electrical-to-terahertz conversion mechanism using the terahertz laser, simplifying the overall system architecture and reducing moving parts and complex circuitry.
2Adaptability or versatility
If electro-optical circuits are used for data communication, then data transfer between temperature regimes is enabled, but loss of energy increases
Solution Approach 1:
The terahertz laser acts as an energy-efficient intermediary that directly converts electrical energy to terahertz radiation, avoiding the energy losses associated with traditional electro-optical conversion methods and cryogenic cooling requirements.
Solution Approach 2:
The patent utilizes changes in the electrical parameters of the terahertz laser (frequency, amplitude) to modulate the terahertz output, enabling efficient data encoding without requiring complex cryogenic electro-optical modulation systems.
3Adaptability or versatility
If direct data link is implemented, then integration of superconducting technology is enhanced, but device complexity increases
Solution Approach 1:
The terahertz laser serves as a bridge that enables superconducting circuits to communicate with standard electro-optical systems without requiring full cryogenic integration of the latter, thus enhancing superconducting technology adoption while limiting complexity growth.
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 higher clock speeds for digital signal processing and serves as an intermediary device for cryogenic systems, enabling efficient data transfer between cryogenic and room temperature platforms, enhancing the integration of superconducting technology.
Implementation Method 1
A direct link from cryogenic circuitry and devices is a goal of the quantum computing community... A sub-micron-scale coherent terahertz (THz) laser is developed using a high-density array of high-temperature superconducting Josephson junctions, enabling a direct one-way link from superconducting to electro-optical circuitry
Data Source
AI summary
A system includes a substrate, a high-temperature superconductor compound film disposed on the substrate, an array of superconducting regions formed within the film, a plurality of Josephson junctions formed within the film, where each Josephson junction of the plurality of Josephson junctions is formed between adjacent superconducting regions within the array of superconducting regions, and a voltage source connected to the array of superconducting regions. The plurality of Josephson junctions are separated by a distance such that they emit coherent radiation in the terahertz frequency range responsive to a voltage applied to the array of superconducting regions.