Non-exponential decay of a giant artificial atom

Andersson, Gustav and Suri, Baladitya and Guo, Lingzhen and Aref, Thomas and Delsing, Per (2019) Non-exponential decay of a giant artificial atom. In: NATURE PHYSICS, 15 (11). pp. 1123-1127.

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Abstract

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 dimensions(1,2). 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 qubit(3) 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 dynamics(4). We demonstrate the non-Markovian character of the giant atom in the frequency spectrum as well as non-exponential relaxation in the time domain.

Item Type:	Journal Article
Publication:	NATURE PHYSICS
Publisher:	NATURE PUBLISHING GROUP
Additional Information:	Copyright of this article belongs to NATURE PUBLISHING GROUP
Keywords:	QUANTUM; PHOTON
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	10 Dec 2019 06:08
Last Modified:	10 Dec 2019 06:08
URI:	http://eprints.iisc.ac.in/id/eprint/63941

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