Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Optics I

Q 2.1: Group Report

Monday, March 5, 2018, 10:30–11:00, K 0.016

Ultrafast quantum optics with temporal modes — •Vahid Ansari, Markus Allgaier, John M Donohue, Matteo Santandrea, Laura Padberg, Christof Eigner, Mahnaz Doostdar, Gesche Vigh, Linda Sansoni, Georg Harder, Benjamin Brecht, and Christine Silberhorn — Integrierte Quantenoptik, Universität Paderborn, Warburger Str. 100, D-33098 Paderborn

Temporal modes of photonic quantum states provide a rich framework for quantum information science. They constitute a high-dimensional Hilbert space and are compatible with the existing single-mode fibre communication networks.

In this report, we show how to create ultrashort single photons in arbitrary temporal shapes, based on ultrafast waveguided parametric down-conversion (PDC) at telecom wavelengths. By tailoring the PDC process, we can control the spectral-temporal structure of the generated states to create separable or entangled photon pairs with a well-defined number of temporal modes.

Then we use a quantum pulse gate (QPG), based on a dispersion-engineered frequency conversion device, to manipulate and detect the underlying temporal structure of multimode PDC states within a high-dimensional space. Using the QPG, we present our recent experiments on temporal-mode tomography, purification of multimode PDC states, efficient bandwidth compression of single photons, and remote state preparation of arbitrary temporal modes.