Phononic bath engineering of a superconducting qubit

Abstract

Phonons, the ubiquitous quanta of vibrational energy, play a vital role in the performance of quantum technologies. Conversely, unintended coupling to phonons degrades qubit performance and can lead to correlated errors in superconducting qubit systems. Regardless of whether phonons play an enabling or deleterious role, they do not typically admit control over their spectral properties, nor the possibility of engineering their dissipation to be used as a resource. Here we show that coupling a superconducting qubit to a bath of piezoelectric surface acoustic wave phonons enables a novel platform for investigating open quantum systems. By shaping the loss spectrum of the qubit via the bath of lossy surface phonons, we demonstrate preparation and dynamical stabilization of superposition states through the combined effects of drive and dissipation. These experiments highlight the versatility of engineered phononic dissipation and advance the understanding of mechanical losses in superconducting qubit systems.

Main text: 17 pages, 5 figures. Supplementary Information: 7 pages, 5 figures

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• Thin-film quartz for high-coherence piezoelectric phononic crystal resonators
• Quantum acoustic Fano interference of surface phonons
• Leveraging collective effects for thermometry in waveguide quantum electrodynamics
• Decoherence of surface phonons in a quantum acoustic system
• High-impedance surface acoustic wave resonators
• Low Temperature Properties of Low-Loss Macroscopic Lithium Niobate Bulk Acoustic Wave Resonators
• Plasmon Mode Engineering with Electrons on Helium
• Time evolving matrix product operator (TEMPO) method in a non-diagonal basis set based on derivative of the path integral expression
• Loss Mechanisms in High-coherence Multimode Mechanical Resonators Coupled to Superconducting Circuits
• Frequency-modulated enhancement of microwave resonator sensing