4.7 Article

Single-mode quantum non-Gaussian light from warm atoms

期刊

NPJ QUANTUM INFORMATION
卷 8, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41534-022-00638-9

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资金

  1. Czech Science Foundation [GA21-13265X]
  2. MEYS [731473]
  3. QUANTERA ERA-NET cofund in quantum technologies within the European Union's Horizon 2020 Programme (project PACE-IN) [8C20004]
  4. Palacky University [IGA-PrF-2022-005]

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The distributed quantum information processing and hybridization of quantum platforms require high-quality light-matter interaction and efficient quantum interfaces. This study demonstrates the generation of light with provably quantum non-Gaussian (QNG) features from a warm atomic ensemble, achieved through fast resonant excitation, large spectral bandwidth, and low absorption loss.
The distributed quantum information processing and hybridization of quantum platforms raises increasing demands on the quality of light-matter interaction and realization of efficient quantum interfaces. This becomes particularly challenging for needed states possessing fundamental quantum non-Gaussian (QNG) aspects. They correspond to paramount resources in most potent applications of quantum technologies. We demonstrate the generation of light with provably QNG features from a warm atomic ensemble in a single-mode regime. The light is generated in a spontaneous four-wave mixing process in the presence of decoherence effects caused by a large atomic thermal motion. Despite its high sensitivity to any excess noise, direct observability of heralded QNG light could be achieved due to a combination of a fast resonant excitation, large spectral bandwidth, and a low absorption loss of resonant photons guaranteed by the source geometry.

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