Freiburg 2019 – wissenschaftliches Programm
FM 84.15: Poster
Donnerstag, 26. September 2019, 16:30–18:30, Tents
Multi-photon Entanglement via Quantum Interference Buffering — Evan Meyer-Scott1, •Nidhin Prasannan1, Ish Dhand2, Christof Eigner1, Viktor Quiring1, Sonja Barkhofen1, Benjamin Brecht1, Martin B Plenio2, and Christine Silberhorn1 — 1University of Paderborn, 33098 Paderborn, Germany — 2Institüt für Theoretische Physik and Center for Integrated Quantum Science and Technology(IQST), University of Ulm, 89069 Ulm, Germany
We present an experimental method to generate multi-photon entangled state which utilises quantum buffering and temporal source multiplexing. Our all optical polarization insensitive buffer memory is able to store photonic qubits with good efficiency and state fidelity. Quantum state tomography reveals photonic qubit state fidelity of 99% for 200ns and above 88% for 1µs storage time. A Sagnac based polarization entangled source is pumped by a femtosecond laser to fire Bell pairs with high entanglement visibility. Combining temporal source multiplexing and memory loop we apply a quantum interference buffering technique to entangle subsequent Bell pairs towards a four photon GHZ state. We achieve a state fidelity above 80% for the GHZ state. Temporal multiplexing of 20 sources shows nine fold increase in four photon generation rates.