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Tantalum thin films are emerging as a critical material advancement for superconducting quantum circuits, offering unprecedented coherence times and quality factors that surpass traditional aluminum and niobium alternatives. Researchers are now focused on resolving specific fabrication challenges, such as managing β-phase impurities and understanding anomalous cryogenic behaviors, to fully optimize these polymorphic properties for next-generation qubits.
Tantalum thin films offer new options for quantum circuits
Tantalum, as an emerging material for next-generation quantum circuits, has attracted considerable attention after demonstrating breakthrough performance in both superconducting microwave resonators and qubits. This interest is further stimulated by tantalum thin films polymorphism, resulting in a variety of its crystalline structure, superconducting properties, and coherence.
Tantalum is gaining traction as a potential foundation for the next generation of superconducting integrated circuits after demonstrating breakthrough performance in both superconducting microwave resonators and qubits. Initial qubit implementations achieved a T1 energy relaxation time exceeding 300 μs in 2021, extended to over 500 μs by 2022, culminating in surpassing 1ms in 2025, and low-power internal quality factors (Qi LP) in coplanar resonators surpassing 10 million for the first time in 2025. Tantalum thin films exhibit distinctive features in cryogenic experiments, behaviors not observed in circuits built from aluminum or niobium. This growing interest is fueled by tantalum's varied crystalline structure and superconducting properties, though several…
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