Attosecond Entangled Photons from Two-Photon Decay of Metastable Atoms:
A Source for Attosecond Experiments and Beyond
- URL: http://arxiv.org/abs/2205.14861v1
- Date: Mon, 30 May 2022 05:33:30 GMT
- Title: Attosecond Entangled Photons from Two-Photon Decay of Metastable Atoms:
A Source for Attosecond Experiments and Beyond
- Authors: Yimeng Wang, Siddhant Pandey, Chris H. Greene, and Niranjan Shivaram
- Abstract summary: We propose the generation of attosecond entangled bi-photons in the extreme-ultraviolet regime by two-photon decay of a metastable atomic state.
The generation rate from a direct four photon excitation of helium at 240 nm is calculated and used to assess some feasible schemes to generate these bi-photons.
- Score: 1.1417805445492082
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We propose the generation of attosecond entangled bi-photons in the
extreme-ultraviolet regime by two-photon decay of a metastable atomic state as
a source similar to spontaneous parametric down-conversion photons. The 1s2s
$^1S_0$ metastable state in helium decays to the ground state by emission of
two energy-time entangled photons with a photon bandwidth equal to the total
energy spacing of 20.62 eV. This results in a pair correlation time in the
attosecond regime making these entangled photons a highly suitable source for
attosecond pump-probe experiments. The bi-photon generation rate from a direct
four photon excitation of helium at 240 nm is calculated and used to assess
some feasible schemes to generate these bi-photons. Possible applications of
entangled bi-photons in attosecond time scale experiments, and a discussion of
their potential to reach the zeptosecond regime are presented.
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