Laser-Programmable Superconducting Fuse Structures for Qubit Tuning
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Solution Overview
Problem
Challenges in tuning qubit frequencies with high precision and addressing fabrication defects in superconducting quantum circuits are hindering the development of reliable quantum computing components.
Innovation Solution
A superconducting connecting system with anti-fuse and fuse structures, utilizing cantilevered traces and auxiliary segments that form electrical shorts or opens upon laser exposure, enabling programmable and reprogrammable quantum circuits with improved connectivity and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If qubit frequencies are tuned using coils or laser or etching into substrate, then qubit frequency precision is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent changes the physical parameter being manipulated from continuous (coil inductance, laser power, etching depth) to discrete (resistive state of fuse/anti-fuse). By using fuses and anti-fuses that create binary resistance states, the patent simplifies the tuning process while achieving precise frequency control through material property changes rather than geometric modifications
Solution Approach 2:
The patent replaces mechanical adjustment methods (coils, physical etching) with a field-based approach using laser-induced resistive changes in fuse structures. The laser activates a phase change or chemical reaction in the fuse material, creating a permanent resistive state that tunes the qubit frequency without mechanical intervention
2Adaptability or versatility
If fuses and anti-fuses are used to program quantum circuits, then adaptability and reconfigurability are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates auxiliary segments that extend beyond the gap between fuse segments. These auxiliary segments act as a buffer or cushion, ensuring that even if the gap varies within manufacturing tolerances, the laser can still effectively bridge the gap and create the desired conductive path. This pre-built tolerance buffer reduces the stringency of gap control requirements
Solution Approach 2:
The patent applies different material properties to different parts of the fuse structure. The auxiliary segments use materials with lower melting points or higher laser absorption coefficients than the main trace materials. This local material differentiation ensures that the laser energy preferentially affects the auxiliary segments and gap region, making the fusing process less sensitive to gap variations
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
Enhances the reliability and efficiency of quantum circuits by allowing for reconfiguration of qubit entanglement and redundancy, improving coherence and fidelity through bidirectional frequency tuning and simplified fabrication processes.
Implementation Method 1
The first segment and the second segment are configured to receive an output of a laser. The materials and geometry of first segment and the second segment and of the gap therebetween are such that a fused ball joint is formed that provided an electrical short between the first segment and the second segment
Implementation Method 2
a fused ball joint is formed that provided an electrical short between the first segment and the second segment
Implementation Method 3
the first and second auxiliary segments are on a same plane as the first and second superconducting traces, but are constructed of different material to lower a melting temperature in creating the fuse ball joint. By lowering the melting temperature, a ball joint that provides an electrical short is more easily produced
Data Source
AI summary
A superconducting connecting system includes an anti-fuse structure. There is a first superconducting trace having a first segment that is cantilevered over a cavity a substrate. A second superconducting trace having a second segment is cantilevered over the cavity in the substrate. A first auxiliary segment is coupled to the first segment and suspended over the cavity. A second auxiliary segment is coupled to the second segment and suspended over the cavity. The first segment and the second segment face each other and have a predetermined gap therebetween. The first segment and the second segment are configured to receive an output of a laser. An amount of material of the first and second auxiliary segment is based on creating a fuse ball joint that provides an electrical short between the first superconducting trace and the second superconducting trace, upon receiving the output of the laser.