Unconventional and robust light-matter interactions based on the non-Hermitian skin effect

• URL: http://arxiv.org/abs/2408.09826v2
• Date: Fri, 23 Aug 2024 14:32:05 GMT
• Title: Unconventional and robust light-matter interactions based on the non-Hermitian skin effect
• Authors: Lei Du, Anton Frisk Kockum,
• Abstract summary: We study a series of unconventional light-matter interactions between quantum emitters and the Hatano--Nelson model. We find that the protection from dissipation arises from a cooperation of the non-Hermiticity and the self-interference effect. These results have potential applications in engineering exotic spin Hamiltonians and quantum networks.
• Score: 1.346671070856618
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Lattice models featuring the non-Hermitian skin effect have attracted rapidly growing interest due to the nontrivial topology associated with their complex energy spectra. Such non-Hermitian lattices are promising paradigms for engineering exotic light-matter interactions which benefit from the intrinsic chirality and unconventional (non-Bloch) band theory. Here we study a series of unconventional light-matter interactions between quantum emitters and the prototypical Hatano--Nelson model as well as an extended lattice model dubbed the bosonic Kitaev chain. We focus on the robustness of the dynamics to various imperfections and elucidate the underlying mechanisms. We consider both small emitters, which interact with the lattice at single sites, and giant emitters coupling at multiple sites. The latter exhibit an exclusive amplification mechanism, which we find enables decoherence-free dynamics even in the presence of extra dissipation in the system. The protection from dissipation arises from a cooperation of the non-Hermiticity and the self-interference effect, and is therefore lacking for small emitters. These results not only provides a deeper insight into the interplay of non-Hermiticity and various interference effects, but also have potential applications in engineering exotic spin Hamiltonians and quantum networks.

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