Berlin 2018 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.9: Poster
Tuesday, March 13, 2018, 18:15–20:15, Poster B
The Giant Atom Regime of Quantum Acoustics — •Gustav Andersson1, Baladitya Suri1, Lingzhen Guo2, Thomas Aref1, Göran Johansson1, and Per Delsing1 — 1Chalmers University of Technology, Gothenburg, Sweden — 2Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
We investigate the dynamics of a superconducting transmon qubit interacting with surface acoustic waves (SAWs) on a piezoelectric substrate through interdigitial transducers. This "quantum acoustic" platform allows us to perform experiments analogous to quantum optics with a crucial difference - the artificial atom has characteristic dimensions much larger than the wavelength of the slow-propagating acoustic field. We engineered artificial atoms that couple to the propagating field at two distant points such that the time of flight of phonons between them introduces a significant, deterministic time delay. This allows us to probe the unexplored "giant atom" regime of quantum optics, with characteristic signatures of non-Markovianity. Phonons emitted into the acoustic channel by such a "giant atom" from one coupling point interact with the atom again through the other point, leading to revivals in the excited state population. A dispersively coupled microwave resonator allows us to read-out the excited state population of the qubit, thereby enabling us to perform its time-domain characterisation. We observe the non-exponential energy relaxation as well as the phonon scattering properties of giant atoms with a resonance frequency in the 2-2.5 GHz range.