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This research from Clarendon Laboratory and Nanofiber Quantum Technologies presents a significant advancement in remote atom-atom entanglement generation using cavity-assisted photon scattering. By achieving a generation rate of 2e5 s^-1 with 0.999 fidelity without requiring qubit reset, the protocol offers a more robust pathway for practical quantum communication networks. The technique effectively mitigates scattering errors and decoherence, addressing key limitations in current two-photon interference methods.

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Clarendon Laboratory boosts atom-atom entanglement with cavity design

Quantum ZeitgeistSeptember 11, 20265 min read

A time- and wavelength-multiplexed remote atom-atom entanglement generation protocol is proposed, based on cavity-assisted photon scattering. This design predicts { 2e5 } s^-1 successful atom-atom Bell pair generation, at a heralded fidelity of 0.999, even without in-cavity qubit reset.

Researchers at Nanofiber Quantum Technologies, Inc. and the Clarendon Laboratory at the University of Oxford have developed a new protocol for generating entangled atom pairs. The work details a time- and wavelength-multiplexed approach using cavity-assisted photon scattering designed to achieve high fidelity and rate despite operational imperfections. The team predicts 2e5 s^-1 successful atom-atom Bell pair generation with a heralded fidelity of 0.999, even without resetting qubits within the cavity, a substantial improvement over existing two-photon interference methods. A light shift of Δa, achieved with moderate laser power, suppresses scattering error to approximately 10^-4, minimizing heating and decoherence of atoms during remote entanglement…

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