Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout

TL;DR

This paper reports the observation of quantum oscillations between a Josephson phase qubit and microscopic resonators, using a novel fast readout technique, shedding light on decoherence mechanisms and two-qubit interactions.

Contribution

The study introduces a significantly faster readout method enabling the detection of quantum oscillations between qubits and microscopic fluctuators.

Findings

Detected coherent quantum oscillations between qubit and fluctuators

Observed oscillation periods match spectroscopic splittings

Demonstrated a new fast readout technique

Abstract

We have detected coherent quantum oscillations between Josephson phase qubits and microscopic critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. The period of the oscillations is consistent with the spectroscopic splittings observed in the qubit's resonant frequency. The results point to a possible mechanism for decoherence and reduced measurement fidelity in superconducting qubits and demonstrate the means to measure two-qubit interactions in the time domain.