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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Optics (Miscellaneous) III

Q 17.6: Vortrag

Dienstag, 15. März 2022, 12:00–12:15, Q-H14

Polarization-entangled photons from nanoscale nonlinear layers — •Vitaliy Sultanov^{1, 2}, Tomás Santiago-Cruz^{1, 2}, and Maria V. Chekhova^{1, 2} — ¹Max-Planck Institute for the Science of Light, Erlangen, Germany — ²Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany

Entanglement is a crucial feature of quantum systems essential for various applications of quantum technologies. One of the most convenient platforms for quantum entanglement realization is photon pairs generated via spontaneous parametric down-conversion (SPDC). However, the phase-matching condition limits the existing bulk SPDC-based sources of entangled photons. The restrictions can be overcome by utilizing phase-matching-free SPDC in nano-scale nonlinear layers.

In this work, we demonstrate, for the first time, polarization-entangled photons from a 400 nm nonlinear layer of gallium phosphide. We achieve an unprecedented tunability of the two-photon polarization state not possible in common bulk sources of photon pairs. The polarization adjustability shown in this work gives an opportunity to easily change a degree of polarization entanglement on demand, making such sources a unique, promising platform for the realization of miniaturized quantum light generators for integrated photonics.