Beyond Spontaneous Emission: Giant Atom Bounded in Continuum

Abstract

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.

arXiv comment8 pages, 4 figures

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• Non-Markovian disentanglement dynamics in double-giant-atom waveguide-QED systems
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• Giant atoms coupled to waveguide: Continuous coupling and multiple excitations
• Selective band interaction and long-range hopping in a structured environment with giant atoms
• Chiral quantum optics with giant atoms
• Non-local scattering control in coupled resonator networks
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• Dispersive bands of bound states in the continuum
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• Oscillating bound states in waveguide-QED system with two giant atoms