Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.6: Poster
Wednesday, March 11, 2026, 18:00–21:00, P4
Non-Markovian bound-state formation in a giant atom with two coupling points — •Mei Yu1, Stefan Nimmrichter2, and Walter Strunz1 — 1TUD Dresden University of Technology, — 2University of Siegen
Superconducting qubits coupled to meandering transmission lines or to surface acoustic waveguides can realize giant artificial atoms, whose interaction with the waveguide occurs at multiple, spatially separated coupling points. Such a geometry introduces well-controlled propagation delays between the coupling points and thereby enables strongly non-Markovian dynamics with memory effects beyond the atomic lifetime [1, 2]. In this work, we investigate the relaxation dynamics of a single giant atom coupled to a one-dimensional acoustic waveguide through two coupling points in the strong-coupling regime. We show that interference between the delayed feedback channels leads to the formation of a bound state embedded in the continuum of waveguide modes, which in turn results in partial population trapping within the giant atom.
[1] L. Guo, A. Grimsmo, A. F. Kockum, M. Pletyukhov, and G. Johansson, Giant acoustic atom: A single quantum system with a deterministic time delay, Phys. Rev. A 95, 053821 (2017).
[2] G. Andersson, B. Suri, L. Guo, T. Aref, and P. Delsing, Non-exponential decay of a giant artificial atom, Nature Physics 15, 1123 (2019).
Keywords: Non-Markovianian dynamics; Bound states; Giant artificial atoms; Population trapping