Quantum Jumps between Macroscopic Quantum States of a Superconducting Qubit Coupled to a Microscopic Two-Level System

TL;DR

This paper reports the observation of quantum jumps between macroscopic quantum states in a superconducting qubit coupled to microscopic two-level systems, providing insights into decoherence sources and potential calibration methods.

Contribution

It demonstrates quantum jumps in a superconducting qubit coupled to two-level systems and confirms their key features experimentally, advancing understanding of decoherence mechanisms.

Findings

Quantum jumps observed between macroscopic quantum states.

Quantum jumps can be used to calibrate two-level systems.

Key features of quantum jumps confirmed experimentally.

Abstract

We report the observation of quantum jumps between macroscopic quantum states in a superconducting phase qubit coupled to the two-level systems in the Josephson tunnel junction, and all key features of quantum jumps are confirmed in the experiments. Moreover, quantum jumps can be used to calibrate such two-level systems, which are believed to be one of the main decoherence sources in Josephson devices.