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Q: Fachverband Quantenoptik und Photonik

Q 79: Cavity QED and QED III

Q 79.4: Vortrag

Freitag, 6. März 2026, 15:15–15:30, P 4

Perfect Quantum State Transfer in a Dispersion-Engineered Waveguide — Zeyu Kuang, •Oliver Diekmann, Lorenz Fischer, Stefan Rotter, and Carlos Gonzalez-Ballestero — Institute for Theoretical Physics, TU Wien, Vienna A-1040, Austria

Faithful transfer of quantum states between distant nodes is a cornerstone of quantum networks, yet even the simplest setups such as two qubits weakly coupled to a waveguide suffer from fundamental efficiency limits related to the temporal shape of the emitted photon. I will present an approach that circumvents this limitation by directly engineering the waveguide dispersion. In particular, I will show how a tailored dispersion profile can reshape the photons wavepacket into the optimal time-reversed form, enabling faithful transfer without external control fields. I will discuss how to design the dispersion relation at different node distances and achieve robustness to variations of these distances.

Keywords: waveguide QED; chiral; dispersion; state transfer