TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.19.1.011
TI  - Generating long-distance magnetic couplings with flat bands
PY  - 2025/07/08
UR  - https://scipost.org/SciPostPhys.19.1.011
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 19
IS  - 1
SP  - 011
A1  - Bouzerar, Georges
AU  - Thumin, Maxime
AB  - One of the great challenges for the large-scale development of quantum technologies is to generate and control the entanglement of quantum bits through interactions of sufficiently long range. Two decades ago, spin chains have been proposed for quantum communication. Unfortunately, couplings are of very short range in general which drastically limits the communication to very short distances. Here, we demonstrate that the presence of flat bands (FBs) can trigger very long-distance magnetic couplings in spin chains. Furthermore, we show that the typical decaying lengthscale is directly related to the quantum metric of the flat band eigenstates. We have validated the robustness of our results in the case where flat bands become weakly dispersive. We believe that our unexpected findings could open up an alternative route to enable long-distance quantum communication.
ER  -

@Article{10.21468/SciPostPhys.19.1.011,
	title={{Generating long-distance magnetic couplings with flat bands}},
	author={Georges Bouzerar and Maxime Thumin},
	journal={SciPost Phys.},
	volume={19},
	pages={011},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.19.1.011},
	url={https://scipost.org/10.21468/SciPostPhys.19.1.011},
}