Exponentially Enhanced Non-Hermitian Cooling

Autor(en)

Haowei Xu, Uros Delic, Guoqing Wang, Changhao Li, Paola Cappellaro, Ju Li

Abstrakt

Certain non-Hermitian systems exhibit the skin effect, whereby the wavefunctions become exponentially localized at one edge of the system. Such exponential amplification of wavefunction has received significant attention due to its potential applications in e.g., classical and quantum sensing. However, the opposite edge of the system, featured by the exponentially wavefunctions, remains largely unexplored. Leveraging this phenomenon, we introduce a non-Hermitian cooling mechanism, which is fundamentally distinct from traditional refrigeration or laser cooling techniques. Notably, non-Hermiticity will not amplify thermal excitations, but rather redistribute them. Hence, thermal excitations can be cooled down at one edge of the system, and the cooling effect can be enhanced by the number of auxiliary modes, albeit with a lower bound that depends on the dissipative interaction with the environment. Non-Hermitian cooling does not rely on intricate properties such as exceptional points or non-trivial topology, and it can apply to a wide range of excitations, such as photons, phonons, magnons, etc.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Massachusetts Institute of Technology

Journal

Physical Review Letters

Band

132

Anzahl der Seiten

7

ISSN

0031-9007

DOI

https://doi.org/10.48550/arXiv.2309.07731

Publikationsdatum

02-2024

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/49943b13-4005-45b8-b61e-485422bae4ae