There is a tension between qubits being able to interact with your quantum gates quickly, and not being able to interact with the environment quickly. Supercond

There is a tension between qubits being able to interact with your quantum gates quickly, and not being able to interact with the environment quickly. Superconducting qbits can work well with gates but last for hundreds of microseconds, while nuclear spin qbits can last for seconds - but don't work so well with gates.