Entanglement dynamics of a superconducting phase qubit coupled to a two-level system

TL;DR

This paper experimentally investigates the entanglement dynamics between a superconducting phase qubit and a two-level system, revealing phenomena like sudden death and revival influenced by decoherence and driving.

Contribution

It provides the first quantitative characterization of entanglement oscillations, including sudden death and revival, in a macroscopic-superconducting and microscopic-two-level system coupling.

Findings

Observation of entanglement oscillations including sudden death and revival

Demonstration of decoherence and ac driving effects on entanglement dynamics

Quantitative analysis of entanglement behavior in a superconducting qubit system

Abstract

We report the observation and quantitative characterization of driven and spontaneous oscillations of quantum entanglement, as measured by concurrence, in a bipartite system consisting of a macroscopic Josephson phase qubit coupled to a microscopic two-level system. The data clearly show the behavior of entanglement dynamics such as sudden death and revival, and the effect of decoherence and ac driving on entanglement.