Certifying non-classicality and non-Gaussianity through optical parametric amplification

• URL: http://arxiv.org/abs/2507.18296v1
• Date: Thu, 24 Jul 2025 11:01:39 GMT
• Title: Certifying non-classicality and non-Gaussianity through optical parametric amplification
• Authors: Mahmoud Kalash, Marcello H. M. Passos, Éva Rácz, László Ruppert, Radim Filip, Maria V. Chekhova,
• Abstract summary: Non-Gaussian states of light are essential for numerous quantum information protocols.<n>We demonstrate theoretically and experimentally that optical parametric amplification combined with conventional intensity detectors can effectively replace this approach.<n>We successfully certify the non-Gaussianity of a heralded quasi-single-photon state.
• Score: 1.1655046053160683
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-Gaussian states of light are essential for numerous quantum information protocols; thus, certifying non-Gaussianity is crucial. Full quantum state tomography achieves this, but it implies observing the Wigner function negativity, which requires efficient detection. Certifying non-Gaussianity through directly measurable parameters is a simpler alternative, typically achieved by measuring photon-number probabilities - either directly using photon-number resolving detectors or through Hanbury Brown-Twiss type measurements with single-photon detectors. Here, we demonstrate theoretically and experimentally that optical parametric amplification combined with conventional intensity detectors can effectively replace this approach without the need for photon-number resolution. In our method, we measure the mean photon number and the second-order correlation function for the amplified state. Using it, we successfully certify the non-Gaussianity of a heralded quasi-single-photon state. Since optical parametric amplification is a multimode process, our method provides a foundation for developing high-dimensional quantum technologies utilizing multimode non-Gaussian states.

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