The road to quantum computing is paved in qubits

The race for the quantum computer will most likely be decided at the quantum bit (qubit) – the smallest information unit of the quantum computer. The coupling of several qubits into a computing system is currently one of the greatest challenges in the development of quantum computers. A key question is which physical system and which material are best suited for qubits. Development of qubits based on superconductors has advanced farthest—but there are increasing signs that silicon semiconductor technology may be a promising alternative with decisive advantages in chip production.