Ultracold circuits

Cooling materials to extremely low temperatures is important for basic physics research as well as for technological applications. By improving a special refrigerator and a low-temperature thermometer, scientists have now managed to cool an electric ci…

Key element for a scalable quantum computer

Millions of quantum bits are required for quantum computers to prove useful in practical applications. But this is still a long way off. One problem is that the qubits have to be very close to each other on the chip. Researchers have now come a signifi…

Cobalt-free cathode for lithium-ion batteries

Researchers offer a new mixture of metallic elements to serve as lithium-ion cathodes. This ‘high-entropy doping strategy’ is part of an effort to remove cobalt — and expensive and geopolitically problematic mineral — from LI batteries.