Scientists at New York University (NYU) and the University of Queensland have demonstrated a breakthrough: a new form of germanium that becomes superconducting once doped with gallium, tells Live Science. By replacing roughly one in eight germanium atoms with gallium during crystal growth via molecular beam epitaxy, the team created a material that loses electrical resistance below about 3.5 Kelvin, significantly higher than the ~1 K transition temperature of pure gallium.
Unlike earlier attempts that damaged the semiconductor lattice, this approach retains a clean, ordered crystal structure. That crystalline integrity matters: it allows dense, wafer-scale integration of superconducting elements without the disorder that typically causes performance problems or signal loss.
One practical implication: the team estimates a single 2-inch wafer could host around 25 million Josephson junction devices, i.e., the building blocks for superconducting qubits or quantum-enabled circuitry. That opens the door to combining conventional semiconductor (classical) logic and quantum elements on the same chip.
This hybrid capability could dramatically accelerate quantum-classical integration. Because germanium is compatible with existing chip-fabrication infrastructure (silicon-germanium or silicon-foundry processes), introducing superconducting germanium may not require a full retooling of manufacturing pipelines.
If developed further, this could shift the landscape for quantum computing, cryogenic electronics, high-density sensors, and hybrid classical-quantum systems, making quantum power and classical control co-exist on a single die.