According to the industry on March 17, quantum computers use quantum mechanics — including superposition and entanglement — to perform complex calculations far faster than conventional computers.
As the quantum computing sector enters a growth phase, indium’s strategic value has risen. Academic sources say indium is needed to make connectors for QPU (quantum processing unit) chipsets, which serve as the “brain” of quantum computers. Indium phosphide (InP) is also cited as a key material for producing photonic integrated circuits (PIC). Demand for indium is likely to increase as quantum computers improve and move closer to commercialization.
The United States, home to many advanced technology companies, is working at the national level to advance quantum computing. In November 2025, the U.S. Department of Energy said it would provide $625 million to support next-generation research programs at the National Quantum Information Science Research Centers (NQISRC). The U.S. has also supported quantum technology research systematically since enacting the National Quantum Initiative Act in 2018.
As the industry develops, securing stable supplies of key materials is increasingly seen as central to competitiveness and economic security. Indium is used not only in quantum computing but also widely in displays, touchscreens, thin-film solar power systems and advanced semiconductors.
With indium’s importance growing, Korea Zinc has also come into focus. The company produces 99.999% high-purity indium using what it calls rare-metal concentration and recovery technology based on an integrated zinc, lead and copper process.
After Chairman Choi Yun-beom took office, Korea Zinc raised indium output to about 90 to 100 metric tons a year. It produced 97 tons in 2025.
Korea Zinc’s role in the U.S. indium supply chain is significant. According to the U.S. Geological Survey, South Korea ranked No. 1 in indium exports to the United States from 2020 to 2023, accounting for 29% of U.S. indium imports over that period. Given that Korea Zinc is the only indium producer in South Korea, the company effectively serves as a key partner supporting U.S. supply chains for advanced industries.
“Indium is a critical mineral whose strategic importance is being highlighted not only in displays and semiconductors but also recently in the quantum computing industry,” a Korea Zinc official said. “As the only indium producer in South Korea, Korea Zinc will fulfill its role and responsibility as a backbone industry, based on world-class rare-metal recovery technology.”
* This article has been translated by AI.
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