🔬 By using the MBE method, researchers have succeeded in creating gallium-doped germanium layers that achieve superconductivity without damaging the crystal structure. In this method, approximately one gallium atom out of every eight germanium atoms is replaced and the transition to the superconducting state is achieved.

The outstanding feature of this structure is very little atomic disorder; A factor that makes it very suitable for making low-noise quantum components, such as qubits. This high crystal quality is an important advantage over many common superconducting materials.

The transition temperature of superconductivity is about 3.5 K, which is higher than pure gallium. This material enables very dense production of Josephson bonds; So that up to 25 million Josephson pairs can be placed on a 2-inch wafer.

This achievement paves the way for classical-quantum hybrid chips due to its compatibility with silicon technologies and enables the integration of conventional control and quantum performance on a single platform.

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