Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantum Optics (Miscellaneous) III
Q 17.6: Talk
Tuesday, March 15, 2022, 12:00–12:15, Q-H14
Polarization-entangled photons from nanoscale nonlinear layers — •Vitaliy Sultanov1, 2, Tomás Santiago-Cruz1, 2, and Maria V. Chekhova1, 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.