Implementation of quantum driving for high-fidelity and energy-efficient single-qubit gates.

Single-qubit gates (SQG) are typically implemented by directly driving the qubit through an open transmission line. We study an alternative driving scheme, called quantum driving (QD), where the qubit is controlled by a quantized electromagnetic field, here a single mode of a coplanar waveguide (CPW) resonator. The estimated error is inversely proportional to the average number of photons in the resonator, which enables high-fidelity of SQG in this QD scheme. Furthermore, QD is energy efficient since the single-mode CPW resonator consumes two orders of magnitude less energy compared with an open transmission line in direct driving. Energy-efficient high-fidelity SQG with QD is a promising driving scheme for superconducting qubits to build a scalable quantum processor. We present numerical and experimental results of the single-qubit gate using the QD scheme.