Recent years have seen a strong interest in the possibility to enhance classical and quantum sensing in suitably engineered non-Hermitian multimode systems, displaying e.g. parity-time symmetry or topological phases. The bosonic Kitaev-Majorana chain is a proposed non-Hermitian topological model that is predicted to feature enhanced responsivity to small perturbations, linked to unidirectional amplification. We report an experimental realization of the bosonic Kitaev chain in a nano-optomechanical network, in which two-mode squeezing and beamsplitter interactions between nanomechanical modes are generated through temporally modulated radiation pressure control fields. We demonstrate that this system displays a dramatic sensitivity to boundary conditions, and a unique exponential scaling of the responsivity to a small perturbation with the number of resonators.
The question whether the efficiency of thermodynamic devices such as heat engines and refrigeration is altered through the breaking of time-reversal symmetry has been a topic of significant debate. We experimentally investigate the cooling of nanomechanical resonators in multimode optomechanical devices, in which time-reversal symmetry for thermal fluctuations can be broken through suitable temporal modulation of the radiation pressure control field. We study the resultant nonreciprocal transport of thermal vibrations, and show that the controlled breaking of time-reversal symmetry through synthetic magnetic fields can enhance the cooling performance, yielding lower phonon occupancies than the conventional limit.
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