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QI: Fachverband Quanteninformation

QI 9: Photonic Quantum Technologies (joint session Q/QI)

QI 9.7: Vortrag

Dienstag, 7. März 2023, 12:30–12:45, A320

Spatially and spectraly indistinguishable single mode photons from domain-engineered crystal — •Baghdasar Baghdasaryan^1,2, Fabian Steinlechner^3,4, and Stephan Fritzsche^1,2,4 — ¹Theoretisch-Physikalisches Institut, Friedrich Schiller University Jena, 07743 Jena, Germany — ²Helmholtz-Institut Jena, 07743 Jena, Germany — ³Fraunhofer Institute for Applied Optics and Precision Engineering IOF, 07745 Jena, Germany — ⁴Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany

Pure single-photon sources are currently one of the most important goals of photonic quantum technologies. A heralded single photon from spontaneous parametric down-conversion (SPDC) is a good candidate for a pure single-photon source. However, the photons from SPDC occur in pairs, that are highly correlated in space and frequency. This correlation reduces the purity of the heralded photons. Domain-engineered crystals with a Gaussian nonlinear response have been successfully used to minimize spectral correlations and enhance spectral purity in SPDC. However, a general approach, which minimizes both, spectral and spatial correlations, is still lacking. We go beyond the ansatz of the Gaussian nonlinear response and find a general nonlinear response that maximizes both the spatial and spectral purity of the SPDC emission.