Rapid Driven Reset of a Qubit Readout Resonator

A promising approach for constructing networks of solid-state qubits for quantum information processing is the circuit QED architecture. In such a setup, the speed at which a qubit measurement can be turned on and off is limited by the time constant of a readout resonator. The authors demonstrate a method for populating and depopulating this resonator quickly and precisely, without prior knowledge of the qubit's state---an elegant and practical technique to help speed up a quantum computer.