SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.45: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Improving frequency superresolution with a resonant quantum pulse gate — •Dana Echeverría-Oviedo, Michael Stefszky, Jano Gil-López, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS).

The application of temporal mode selective measurements for time-frequency quantum metrology has been shown to reach the ultimate precision limit imposed by quantum mechanics and therefore saturate the quantum Cramér-Rao lower bound. These measurements can be implemented with a quantum pulse gate (QPG), a dispersion engineered device based on sum frequency generation between shaped pulses. In practice, the QPG finite phasematching (PM) bandwidth (BW) limits the achievable resolution of such measurements. Increasing the QPG length reduces its PM BW. However, building longer QPGs is not a trivial task since nonlinear crystals cannot be arbitrarily long and longer samples are more sensitive to fabrication imperfections degrading its PM spectrum. To alleviate this limitation, it is of paramount importance to tailor narrower PM BW, pushing the QPG to its performance limit. We propose a resonant QPG, which is composed of two coupled waveguide cavities. One of them is a nonlinear cavity in which the interaction occurs, while the other acts as a coherent filter to obtain a single resonance mode. Our design reduces the PM BW by 3 orders of magnitude for the same nonlinear interaction length of the corresponding QPG, yielding a 5.9 better resolution in superresolved metrology measurements.