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Updated: May 14, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Brillouin super-cooling/heating in a non-Hermitian phononic dimer
Yicheng Zhu1, Boyi Xue1, Yuncong Sun1
1State Key Laboratory of Photonics and Communications, University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
Abstract:
The ability to coherently manipulate phonons through light permits cooling and heating microscale quantum systems for various critical fields in metrology, information processing, and sensing. However, these physical systems often are hard to isolate and open for exchanging energy externally, making themselves non-Hermitian. Here, we experimentally observe a super-cooling/heating state in a non-Hermitian phononic dimer, where the two independent phonon modes of distinct cooling/heating rates become synchronous in cooling/heating. Such super cooling/heating is manifested in a Parity-Time symmetric state controlled by two counterpropagating optical pumps. These results reveal the non-Hermitian nature of the phonon dimer and illustrate a coherent technique for synchronous cooling/heating non-Hermitian systems, paving the way for practical applications in quantum sensing and metrology.
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