Fast Readout and Reset of a Superconducting Qubit Coupled to a Resonator with an Intrinsic Purcell Filter
Yoshiki Sunada, S. Kono, Jesper Ilves, Shuhei Tamate, Takanori Sugiyama, Yutaka Tabuchi, Yasunobu Nakamura
Abstract
Quantum information processing requires qubits that can retain their energy for a long time, and one also needs to be able to rapidly manipulate and measure the qubits. The authors utilize the spatial extent of a microwave resonator to meet both of these requirements. They protect a superconducting qubit from energy decay by simply shifting the position of the coupling port in a conventional device. This study demonstrates a simple technique that enables fast readout and reset of a superconducting qubit without compromising its lifetime. The technique could immediately be incorporated into the design of a superconducting quantum computer.