Extraction of autonomous quantum coherences

oleh: Artur Slobodeniuk, Tomáš Novotný, Radim Filip

Format: Article
Diterbitkan: Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften 2022-04-01

Deskripsi

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.