TY - JOUR T1 - Beyond Spontaneous Emission: Giant Atom Bounded in Continuum Y1 - 2019 A1 - Shangjie Guo A1 - Yidan Wang A1 - Thomas Purdy A1 - J. M. Taylor AB -

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. 

UR - https://arxiv.org/abs/1912.09980 ER -