



01240nas a2200145   4500008004100000245006500041210006400106260001500170520080100185100001800986700001601004700001801020700001901038856003701057       2019                        eng d00aBeyond Spontaneous Emission: Giant Atom Bounded in Continuum0 aBeyond Spontaneous Emission Giant Atom Bounded in Continuum  c12/20/20193 a<p>The quantum coupling of individual superconducting qubits to microwave photons leads to remarkable experimental opportunities. Here we consider the phononic case where the qubit is coupled to an electromagnetic surface acoustic wave antenna that enables supersonic propagation of the qubit oscillations. This can be considered as a giant atom that is many phonon wavelengths long. We study an exactly solvable toy model that captures these effects, and find that this non-Markovian giant atom has a suppressed relaxation, as well as an effective vacuum coupling between a qubit excitation and a localized wave packet of sound, even in the absence of a cavity for the sound waves. Finally, we consider practical implementations of these ideas in current surface acoustic wave devices.&nbsp;</p>1 aGuo, Shangjie1 aWang, Yidan1 aPurdy, Thomas1 aTaylor, J., M.  uhttps://arxiv.org/abs/1912.09980