Krypton Gas Could Increasingly Be Used in Quantum Computing

Krypton gas is emerging as an unlikely fix for one of quantum computing’s manufacturing headaches. Cornell researchers have found that replacing argon with krypton gas during a key fabrication step allows tantalum, a metal prized for superconducting devices, to be deposited at much lower temperatures. 

That single change could remove a major obstacle between tantalum’s promise in the lab and its practical use in chip factories, and bring us closer to developing functional quantum computers. Bonding tantalum to a silicon wafer has generally required heat well above 400°C (about 752°F), which is more than many pieces of chip-fabrication equipment are designed to handle. 

The new method brings that figure down to 200°C, or roughly 392°F, and the resulting tantalum layers carry noticeably more current with less resistance, according to findings published in the journal Nature Materials. The research indicates that incorporating krypton gas into quantum computing expands the temperature window and provides additional margin for the reliable fabrication of silicon substrates. 

The approach grew out of the lab’s earlier work with niobium, where argon ions were blasted at a niobium target, dislodging atoms that then settled onto a substrate in a technique known as sputtering. For tantalum, the study’s lead author reasoned that a heavier gas, such as krypton, would strike with greater force. 

That extra force would free tantalum atoms more energetically and lock in the crystal arrangement the material needs to perform well, without requiring intense heat. That shift matters because tantalum’s behavior at different temperatures had posed a real tradeoff. 

At lower temperatures, tantalum settles into a crystal structure that conducts poorly, while overheating it risks mixing with the underlying silicon and degrading chip performance. That lower ceiling gives fabrication equipment already capped at 400°C real breathing room, rather than pushing it right up against its limit. 

The resulting films performed well beyond expectations, the researchers said, yielding qubits strong enough to meet the demands of working quantum processors. The lab’s founder described the result as placing the group’s work at the leading edge of the field, calling it a milestone for both his research group and for the university’s broader quantum computing program. 

Quantum computers rely on superconductors to conduct electricity with almost no resistance, and on qubits built from those materials to hold and process far more information than conventional chips. Finding materials and fabrication methods that work well together has remained one of the field’s toughest hurdles, and this lower-temperature route offers manufacturers a more practical path to using tantalum without requiring costly new equipment. 

With every new applicable innovation in the material science field, businesses like D-Wave Quantum Inc. (NYSE: QBTS) that are developing quantum computing solutions could benefit from these innovations and accelerate their progress to widespread commercialization. 

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