title: Josephson parametric phase-locked oscillator and its application to dispersive readout of superconducting qubits.
abstract: The parametric phase-locked oscillator (PPLO) is a class of frequency-conversion device, originally based on a nonlinear element such as a ferrite ring, that served as a fundamental logic element for digital computers more than 50 years ago. Although it has long since been overtaken by the transistor, there have been numerous efforts more recently to realize PPLOs in different physical systems such as optical photons, trapped atoms, and electromechanical resonators. This renewed interest is based not only on the fundamental physics of nonlinear systems, but also on the realization of new, high-performance computing devices with unprecedented capabilities. Here we realize a PPLO with Josephson-junction circuitry and operate it as a sensitive phase detector. Using a PPLO, we demonstrate the demodulation of a weak binary phase-shift keying microwave signal of the order of a femtowatt. We apply PPLO to dispersive readout of a superconducting qubit, and achieved high-fidelity, single-shot and non-destructive readout with Rabi-oscillation contrast exceeding 90%.
authors: Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan.
authors: Z R
authors: ZR
authors: Lin
authors: Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan.
authors: K
authors: K
authors: Inomata
authors: College of Liberal Arts and Sciences, Tokyo Medical and Dental University, Ichikawa, Chiba 272-0827, Japan.
authors: K
authors: K
authors: Koshino
authors: Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02420, USA.
authors: W D
authors: WD
authors: Oliver
authors: 1] Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan [2] Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan.
authors: Y
authors: Y
authors: Nakamura
authors: 1] Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan [2] Smart Energy Research Laboratories, NEC Corporation, Tsukuba, Ibaraki 305-8501, Japan.
authors: J S
authors: JS
authors: Tsai
authors: 1] Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan [2] Smart Energy Research Laboratories, NEC Corporation, Tsukuba, Ibaraki 305-8501, Japan.
authors: T
authors: T
authors: Yamamoto