Quantum acoustics with propagating phonons
Doktorsavhandling, 2020
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
Författare
Maria Ekström
Chalmers, Mikroteknologi och nanovetenskap, Kvantteknologi
Propagating phonons coupled to an artificial atom
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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