Entangling a Hole Spin with a Time-Bin Photon: A Waveguide Approach for Quantum Dot Sources of Multiphoton Entanglement
Year: 2022
Type: article
Abstract: Deterministic sources of multiphoton entanglement are highly attractive for quantum information processing but are challenging to realize experimentally. In this Letter, we demonstrate a route toward a scaleable source of time-bin encoded Greenberger-Horne-Zeilinger and linear cluster states from a solid-state quantum dot embedded in a nanophotonic crystal waveguide. By utilizing a self-stabilizing double-pass interferometer, we measure a spin-photon Bell state with (67.8±0.4)% fidelity and devise steps for significant further improvements. By employing strict resonant excitation, we demonstrate a photon indistinguishability of (95.7±0.8)%, which is conducive to fusion of multiple cluster states for scaling up the technology and producing more general graph states.
Source: Physical Review Letters
Institutions: University of Copenhagen, Ruhr University Bochum
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1019604613, G1145599077, G3050612773, Center for Hybrid Quantum Networks (Hy-Q), G434337789, G4385729107, Quantum Dots for Photonic Quantum Information Technologies, G6443685199, G71801970, G7203734123, Verbundprojekt: QR.X - Quantenrepeater.Link - QR.X -, Teilvorhaben: Molekularstrahlepitaktisches Wachstum von p-i-n-Dioden mit Quantenpunkt-Molekül-Emittern, G8068201630, Quantum Internet Alliance
OpenAlex ID: W4283453452