Brillouin super- cooling/heating in a non- Hermitian phononic dimer

• 成果类型: Article
• 署名作者: Zhu, Yicheng; Xue, Boyi; Sun, Yuncong; Geng, Qi; Chen, Yuping; Chen, Xianfeng; Jiang, Xiaoshun; Ge, Li; Wan, Wenjie
• 署名单位: Shanghai Jiao Tong University; Shanghai Jiao Tong University; Nanjing University; Nanjing University; City University of New York (CUNY) System; College of Staten Island (CUNY)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9205
• DOI: 10.1073/pnas.2422355122
• 发表日期: 2025-05-12
• 关键词: symmetry

摘要

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.