Propagating acoustic fields at the single-phonon level

Research Topic

Superconducting qubits are presently a key technology for quantum information processing. This project investigates the coupling of such qubits to SAW phonons on piezoelectric substrates in experiments analogous to quantum optics.


By exploiting the short wavelength and slow propagation velocity of SAW, superconducting qubits that couple to a propagating field at two distant points can be designed such that the SAW travel time between them has to be taken into account, creating a “giant” artificial atom. The main goal of this project is to observe the non-exponential decay of a giant atom coupled to a SAW transmission line. The project will establish a lithography process for fabricating highly-resolved IDT structures and tunnel junction-based superconducting transmon qubits. Using microwave measurement techniques at low temperatures, the phonon scattering properties and decay dynamics of the giant atom will be investigated.


Gustav Andersson

Host: Chalmers University of Technology, Department of Microtechnology and Nanoscience MC2

Scientific Background

I hold a Master’s degree in condensed matter physics from Technische Universität München. My thesis work was carried out at the Walther-Meißner-Institut in Garching, focusing on transmon qubits coupled to superconducting 3D cavities.

Conference/Workshop Contributions
    • Quantum acoustics with qubits: the SAW giant atom
      G. Andersson, B. Suri, L. Guo, T. Aref, M. K. Ekström, A. Ask, G. Johansson, P. Delsing
      SAWtrain Summer School: Physics and applications of GHz vibrations in semiconductors (Cargèse, France, Jul. 11-21, 2017) | Internal
Conference/Workshop Contributions
    • Non-exponential decay of a giant artificial atom
      G. Andersson
      Spice workshop: Quantum Acoustics meet Surface Acoustic Waves meets Solid State Qubits (Mainz, Germany, May 17-20, 2016) | Internal