Deterministic photon source of genuine three-qubit entanglement

Yijian Meng, Ming Lai Chan, Rasmus B. Nielsen, Martin H. Appel, Zhe Liu, Ying Wang, Nikolai Bart, Andreas D. Wieck, Arne Ludwig, Leonardo Midolo, Alexey Tiranov, Anders S. Sørensen and Peter Lodahl ()
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Yijian Meng: University of Copenhagen
Ming Lai Chan: University of Copenhagen
Rasmus B. Nielsen: University of Copenhagen
Martin H. Appel: University of Copenhagen
Zhe Liu: University of Copenhagen
Ying Wang: University of Copenhagen
Nikolai Bart: Ruhr-Universität Bochum
Andreas D. Wieck: Ruhr-Universität Bochum
Arne Ludwig: Ruhr-Universität Bochum
Leonardo Midolo: University of Copenhagen
Alexey Tiranov: University of Copenhagen
Anders S. Sørensen: University of Copenhagen
Peter Lodahl: University of Copenhagen

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Deterministic photon sources allow long-term advancements in quantum optics. A single quantum emitter embedded in a photonic resonator or waveguide may be triggered to emit one photon at a time into a desired optical mode. By coherently controlling a single spin in the emitter, multi-photon entanglement can be realized. We demonstrate a deterministic source of three-qubit entanglement based on a single electron spin trapped in a quantum dot embedded in a planar nanophotonic waveguide. We implement nuclear spin narrowing to increase the spin dephasing time to $${T}_{2}^{*}\simeq 33$$ T 2 * ≃ 33 ns, which enables high-fidelity coherent optical spin rotations, and realize a spin-echo pulse sequence for sequential generation of spin-photon and spin-photon-photon entanglement. The emitted photons are highly indistinguishable, which is a key requirement for scalability and enables subsequent photon fusions to realize larger entangled states. This work presents a scalable deterministic source of multi-photon entanglement with a clear pathway for further improvements, offering promising applications in photonic quantum computing or quantum networks.

Date: 2024
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DOI: 10.1038/s41467-024-52086-y

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