Quantum acoustics with propagating phonons
Doktorsavhandling, 2020

Surface acoustic waves (SAWs) are mechanical vibrations that propagate on the surface of solids while dissipating little power, consequently enabling them to propagate freely over long distances. The speed and wavelength of SAWs are reduced a five order of magnitude compared to when light is used as a carrier at gigahertz frequencies. The unique properties of SAWs combined with the possibility to let them interact with artificial atoms, discovered and shown for the very first time in appended Paper I of this thesis, open up for exploration of new regimes of quantum physics. The appended Paper II is a book chapter providing an overview of many of the new areas of research, as well as going into depth of the method and significance of the results ofthe appended Paper I.

The essential interaction between artificial atoms and SAWs was further investigated by using Autler-Townes splitting to achieve fast control of the interactions. The appended Paper IV, shows a transmitted field extinction of 80 %, and provides proof of concept for a SAW router in the quantum regime. In addition, due to the artificial atom's highly frequency dependent coupling to SAWs, electromagnetically induced transparency (EIT) could be observed in the appended Paper V. Furthermore, the EIT region was distinguished from the Autler-Townes splitting region by a threshold in the applied power. The results produce parallel findings to quantum optics, but are perhaps best described as part of a different field, quantum acoustics.

Among the many possible areas of research emerging as an outcome of this work, a variety of potential quantum experiments would benefit greatly from a higher conversion efficiency between electric signals and SAWs. Due to this, focus was put on improving this conversion efficiency by studying superconducting unidirectional transducers (UDTs), making use of advances in classical SAW devices. The appended Paper III shows that 99.4~\% of the acoustic power can be focused in a desired direction and that the conversion between electric signals and SAWs is greatly improved by using UDTs, thereby eliminating the largest source of loss of symmetric inter-digital transducers. There is, however, a trade-off between conversion efficiency and bandwidth. This finding allows tailoring of quantum experiments based on SAWs that may pave the way towards measuring quantum sound.

phonon router

unidirectional transducer

phonon

Electromagnetically Induced Transparency

Surface acoustic wave

artificial atom

interdigital transducer

quantum acoustics

qubit

superconducting circuits

Kollektorn, Kemivägen 9
Opponent: Professor Christopher Bäuerle, Department of Nanoscience, Néel Institute, CNRS Grenoble

Författare

Maria Ekström

Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi

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Artikel i vetenskaplig tidskrift

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Superconducting Devices in Quantum Optics,;(2016)p. 217-244

Kapitel i bok

Electromagnetically Induced Acoustic Transparency with a Superconducting Circuit

Physical Review Letters,;Vol. 124(2020)

Artikel i vetenskaplig tidskrift

Styrkeområden

Nanovetenskap och nanoteknik

Fundament

Grundläggande vetenskaper

Drivkrafter

Innovation och entreprenörskap

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Nanoteknik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik

Infrastruktur

Nanotekniklaboratoriet

ISBN

978-91-7905-330-7

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4797

Utgivare

Chalmers

Kollektorn, Kemivägen 9

Opponent: Professor Christopher Bäuerle, Department of Nanoscience, Néel Institute, CNRS Grenoble

Mer information

Senast uppdaterat

2023-11-13