Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 84: Poster: Quantum Networks

FM 84.15: Poster

Thursday, September 26, 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.