Exponentially Enhanced non-Hermitian Cooling

Abstract

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 suppressed 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 exponentially 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 Bosonic modes such as photons, phonons, magnons, etc.

13 pages, 4 figures

References in corpus (10)

• Topological Origin of Non-Hermitian Skin Effects
• Efficient Light Funneling based on the non-Hermitian Skin Effect
• Nonreciprocal Photon Transmission and Amplification via Reservoir Engineering
• Observation of parity-time symmetry breaking in a single spin system
• Noiseless nonreciprocity in a parametric active device
• Nonreciprocal microwave signal processing with a Field-Programmable Josephson Amplifier
• Mixed-state evolution in the presence of gain and loss
• Two-resonator circuit QED: A superconducting quantum switch
• The Emergency of Pico-Kelvin Physics
• Laser Cooling of Nuclear Magnons

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• Dynamical non-Hermitian systems: Fingerprints and pure dephasing induced protection effect
• Sympathetic Cooling of Levitated Optomechanics through Nonreciprocal Coupling