Oscillating bound states for a giant atom
Journal article, 2020

We investigate the relaxation dynamics of a single artificial atom interacting, via multiple coupling points, with a continuum of bosonic modes (photons or phonons) in a one-dimensional waveguide. In the nonMarkovian regime, where the traveling time of a photon or phonon between the coupling points is sufficiently large compared to the inverse of the bare relaxation rate of the atom, we find that a boson can be trapped and form a stable bound state. As a key discovery, we further find that a persistently oscillating bound state can appear inside the continuous spectrum of the waveguide if the number of coupling points is more than two since such a setup enables multiple bound modes to coexist. This opens up prospects for storing and manipulating quantum information in larger Hilbert spaces than available in previously known bound states.


Lingzhen Guo

Max Planck Society

Anton Frisk Kockum

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Florian Marquardt

Max Planck Society

University of Erlangen-Nuremberg (FAU)

Göran Johansson

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics


2643-1564 (eISSN)

Vol. 2 4 043014

Giant atoms - a new regime in quantum optics

Swedish Research Council (VR), 2020-01-01 -- 2023-12-31.

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics



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