Non-exponential decay of a giant artificial atom
| Autor: | Thomas Aref, Gustav Andersson, B. Suri, Per Delsing, Lingzhen Guo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Condensed Matter::Quantum Gases
Quantum optics Physics Quantum Physics Field (physics) FOS: Physical sciences General Physics and Astronomy Acoustic wave 7. Clean energy 01 natural sciences 010305 fluids & plasmas Wavelength Orders of magnitude (time) Qubit 0103 physical sciences Atom Physics::Atomic and Molecular Clusters Physics::Atomic Physics Exponential decay Atomic physics Quantum Physics (quant-ph) 010306 general physics |
| Zdroj: | Nature Physics. 15:1123-1127 |
| ISSN: | 1745-2481 1745-2473 |
| DOI: | 10.1038/s41567-019-0605-6 |
| Popis: | In quantum optics, light–matter interaction has conventionally been studied using small atoms interacting with electromagnetic fields with wavelength several orders of magnitude larger than the atomic dimensions1,2. In contrast, here we experimentally demonstrate the vastly different ‘giant atom’ regime, where an artificial atom interacts with acoustic fields with wavelength several orders of magnitude smaller than the atomic dimensions. This is achieved by coupling a superconducting qubit3 to surface acoustic waves at two points with separation on the order of 100 wavelengths. This approach is comparable to controlling the radiation of an atom by attaching it to an antenna. The slow velocity of sound leads to a significant internal time-delay for the field to propagate across the giant atom, giving rise to non-Markovian dynamics4. We demonstrate the non-Markovian character of the giant atom in the frequency spectrum as well as non-exponential relaxation in the time domain. By coupling a superconducting qubit to surface acoustic waves the ‘giant atom’ regime is realized, where an atom is coupled to a field with wavelength orders of magnitude smaller than the atomic size. This leads to non-Markovian qubit dynamics. |
| Databáze: | OpenAIRE |
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