Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 16: Precision Measurements and Metrology IV (joint session Q/A)

A 16.4: Talk

Wednesday, March 16, 2022, 11:30–11:45, Q-H11

Tailoring narrower phase-matching bandwidth with resonant quantum pulse gate — •Dana Echeverria-Oviedo, Michael Stefszky, Jano Gil-Lopez, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Warburguer Str. 100, 33098, Paderborn, Germany.

Time-frequency quantum metrology has been shown to saturate the quantum Cramér-Rao lower bound -the ultimate precision limit imposed by quantum mechanics- if temporal-mode selective measurements can be implemented. These can be realized with a so-called quantum pulse gate, a dispersion engineered sum-frequency generation between shaped pulses. In practice, the achievable resolution of such measurements is limited by the finite phase-matching bandwidth of the quantum pulse gate. It is of paramount importance to tailor narrower phase-matching bandwidths to alleviate this limitation and push technology further towards practical applications. We propose a resonant quantum pulse gate, which is comprised of two coupled waveguide cavities that reduce the phase-matching bandwidth, one of them the nonlinear cavity in which the interaction takes place, the other an additional linear cavity which helps to select only one single resonance. Our design facilitates a reduction in phase-matching bandwidth by several orders of magnitude compared to existing devices. In this talk, we report on the current progress in which our team is working with great effort.