Enhancing the purity of single photons in parametric down-conversion
through simultaneous pump-beam and crystal-domain engineering
- URL: http://arxiv.org/abs/2306.15569v2
- Date: Thu, 17 Aug 2023 15:44:33 GMT
- Title: Enhancing the purity of single photons in parametric down-conversion
through simultaneous pump-beam and crystal-domain engineering
- Authors: Baghdasar Baghdasaryan, Fabian Steinlechner, Stephan Fritzsche
- Abstract summary: We study the impact of domain engineering on spatial correlations of generated photons.
We achieve purity of single-photon state up to 99 % without any spatial filtering.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Spontaneous parametric down-conversion (SPDC) has shown great promise in the
generation of pure and indistinguishable single photons. Photon pairs produced
in bulk crystals are highly correlated in terms of transverse space and
frequency. These correlations limit the indistinguishability of photons and
result in inefficient photon sources. Domain-engineered crystals with a
Gaussian nonlinear response have been explored to minimize spectral
correlations. Here, we study the impact of such domain engineering on spatial
correlations of generated photons. We show that crystals with a Gaussian
nonlinear response reduce the spatial correlations between photons. However,
the Gaussian nonlinear response is not sufficient to fully eliminate the
spatial correlations. Therefore, the development of a comprehensive method to
minimize these correlations remains an open challenge. Our solution to this
problem involves simultaneous engineering of the pump beam and crystal. We
achieve purity of single-photon state up to 99 \% without any spatial
filtering. Our findings provide valuable insights into the spatial waveform
generated in structured SPDC crystals, with implications for applications such
as boson Sampling.
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