A superconducting qubit is a quantum bit implemented with an electrical circuit made from superconducting materials. At very low temperatures, the circuit can exhibit quantum states that represent and manipulate information. These qubits are controlled with specialised hardware and software, often in a laboratory or data-centre environment.
Superconducting qubits are one approach to building quantum computers, but they are sensitive to noise and require careful operation. In cybersecurity, the qubit itself is only part of the concern: its control systems, connected classical computers, maintenance access, and facility procedures also need protection. Defenders should inventory these connections, authenticate operators and service activity, and segment control systems from unrelated networks. These measures help limit the risks a specialised quantum system inherits from the infrastructure around it.