Related Experiment Video
Updated: Aug 19, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
Decoherence in josephson phase qubits from junction resonators
R W Simmonds1, K M Lang, D A Hite
1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305-3328, USA.
Abstract:
Although Josephson junction qubits show great promise for quantum computing, the origin of dominant decoherence mechanisms remains unknown. Improving the operation of a Josephson junction based phase qubit has revealed microscopic two-level systems or resonators within the tunnel barrier that cause decoherence. We report spectroscopic data that show a level splitting characteristic of coupling between a two-state qubit and a two-level system. Furthermore, we show Rabi oscillations whose "coherence amplitude" is significantly degraded by the presence of these spurious microwave resonators. The discovery of these resonators impacts the future of Josephson qubits as well as existing Josephson technologies.
Related Concept Videos
Phase Transitions
Oscillations In An LC Circuit
Resonance in an AC Circuit
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Characteristics of Series Resonant Circuit
Phase Transitions

