Extraction of autonomous quantum coherences

• URL: http://arxiv.org/abs/2106.15721v3
• Date: Thu, 14 Apr 2022 16:18:10 GMT
• Title: Extraction of autonomous quantum coherences
• Authors: Artur Slobodeniuk, Tom\'a\v{s} Novotn\'y, Radim Filip
• Abstract summary: A low-temperature environment can induce quantum coherence of a spin without an external coherent pump. We prove that such coherence is extractable by a weak coupling to an output system dynamically affecting back the spin-environment coupling. The proposed optimal coherence extraction opens paths for the upcoming experimental tests with atomic and solid-state systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum coherence is an essential resource to gain advantage over classical physics and technology. Recently, it has been proposed that a low-temperature environment can induce quantum coherence of a spin without an external coherent pump. We address a critical question if such coherence is extractable by a weak coupling to an output system dynamically affecting back the spin-environment coupling. Describing the entire mechanism, we prove that such extraction is generically possible for output spins (also oscillators or fields) and, as well, in a fermionic analogue of such a process. We compare the internal spin coherence and output coherence over temperature and characteristic frequencies. The proposed optimal coherence extraction opens paths for the upcoming experimental tests with atomic and solid-state systems.

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