Optomechanical realization of the bosonic Kitaev chain
成果类型：
Article
署名作者：
Slim, Jesse J.; Wanjura, Clara C.; Brunelli, Matteo; del Pino, Javier; Nunnenkamp, Andreas; Verhagen, Ewold
署名单位：
AMOLF; University of Queensland; Max Planck Society; University of Basel; Swiss Federal Institutes of Technology Domain; ETH Zurich; University of Vienna
刊物名称：
Nature
ISSN/ISSBN：
0028-6983
DOI：
10.1038/s41586-024-07174-w
发表日期：
2024-03-28
关键词：
摘要：
The fermionic Kitaev chain is a canonical model featuring topological Majorana zero modes1. We report the experimental realization of its bosonic analogue2 in a nano-optomechanical network, in which the parametric interactions induce beam-splitter coupling and two-mode squeezing among the nanomechanical modes, analogous to hopping and p-wave pairing in the fermionic case, respectively. This specific structure gives rise to a set of extraordinary phenomena in the bosonic dynamics and transport. We observe quadrature-dependent chiral amplification, exponential scaling of the gain with system size and strong sensitivity to boundary conditions. All these are linked to the unique non-Hermitian topological nature of the bosonic Kitaev chain. We probe the topological phase transition and uncover a rich dynamical phase diagram by controlling interaction phases and amplitudes. Finally, we present an experimental demonstration of an exponentially enhanced response to a small perturbation3,4. These results represent the demonstration of a new synthetic phase of matter whose bosonic dynamics do not have fermionic parallels, and we have established a powerful system for studying non-Hermitian topology and its applications for signal manipulation and sensing. We report the experimental realization of a bosonic Kitaev chain in a nano-optomechanical network.