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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Implementation of a quantum metamaterial using superconducting qubits.

Pascal Macha¹, Gregor Oelsner², Jan-Michael Reiner³

¹1] Leibniz Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany [2] Physikalisches Institut, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany [3] ARC Centre for Engineered Quantum Systems, University of Queensland, Brisbane, Queensland 4072, Australia.

Nature Communications

|October 15, 2014

Summary

This summary is machine-generated.

Researchers demonstrated a quantum metamaterial using 20 superconducting flux qubits in a microwave resonator. They observed collective coupling and the AC-Zeeman shift, showcasing a mesoscopic spin ensemble.

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Area of Science:

Quantum physics
Metamaterials science
Superconducting circuits

Background:

Natural atoms interact with electromagnetic fields as quantum two-level systems.
Artificial quantum two-level systems can be created using superconducting nonlinear resonators.
Demonstrating collective modes in metamaterials is crucial for their implementation.

Purpose of the Study:

To experimentally demonstrate the existence of collective modes in a quantum metamaterial.
To investigate the collective resonant coupling of artificial quantum systems.
To realize a mesoscopic limit of naturally occurring spin ensembles.

Main Methods:

Embedding 20 superconducting flux qubits into a microwave resonator.
Operating qubits at their ground state.
Observing the dispersive shift of the resonator frequency and collective resonant coupling.

Main Results:

Observed the dispersive shift of the resonator frequency due to the qubit metamaterial.
Demonstrated collective resonant coupling of eight qubits.
Showcased the AC-Zeeman shift of a resonant qubit ensemble.

Conclusions:

The experiment successfully implemented a basic quantum metamaterial.
The system serves as a mesoscopic analogue to natural spin ensembles.
Collective coupling of artificial atoms to a quantized photon field mode was achieved.