Scalable Quantum Circuit and Control for a Superconducting Surface Code

While the power of quantum computers scales exponentially with the number of qubits, harnessing this power is challenging, due to complexity of controlling a large number of qubits simultaneously. The authors show how error correction and logical operations can be performed on an $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}d\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}f\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e$ number of superconducting qubits, by repetition of a unit cell and a fixed set of control components. This solution offers an integrated, basic building block for fault-tolerant quantum computation, and thus is a step forward in addressing the scalability issues in quantum-computer engineering.