In my opinion the most significant barrier to wider adoption of quantum computing is scalability with stability. Current quantum processors face problems such as qubit decoherence, high error rates, and the difficulty of maintaining quantum states at extremely low temperatures. These challenges make it hard to build systems that are powerful and practical for real-world use. To overcome this barrier two things need to happen. First, breakthroughs in error correction and qubit materials are required, such as developing more robust qubits and efficient quantum error correction methods. Second, stronger ecosystem support is needed through investment in software frameworks, cloud accessibility, and collaboration between academia, startups, and industry leaders. By improving both stability and usability, quantum computing can move from niche experimentation to mainstream adoption in areas like drug discovery, materials science, and optimization.
Manufacturing scalability is one of the most significant challenges preventing widespread adoption of novel semiconductor technologies like gallium nitride (GaN) or silicon carbide (SiC). Both materials show clear advantages over silicon when it comes to efficiency and performance; however, the costs associated with the manufacturing processes for those materials remains excessively expensive and technically difficult to implement at scale. Neither yield rates are low, the fabrication tools are specialized, and supply chains lack some historical maturity compared to silicon. In order to bring down the costs associated with GaN and SiC manufacturing, there are two things that must happen: first, there will need to be more investment in fabrication infrastructure, which should then drive down per-unit cost of manufacturing due to economies of scale, and second, there finding ways to standardize as an ecosystem for chipmakers, equipment suppliers and end-users type of standardization. Once larger foundries begin to develop processes consistent with the GaN and SiC technologies, the ecosystem will stabilize, costs will drop, and scaling of the manufacturing process will improve. The potential is tremendous, as GaN and SiC can disrupt industries ranging from EV to renewable energy, but until scalability, cost parity and ecosystem level, most adoption will only happen for niche and high-performing capability applications.