Bennett et al.: distilling noisy entanglement for faithful teleportation

What changed

Local operations coordinated by classical messages can distill fewer high-quality entangled pairs from many imperfect two-qubit pairs whose singlet fidelity exceeds one half. The work introduces two-way recurrence purification and seeded asymptotic breeding, providing entanglement that can support faithful teleportation across a noisy link.

Scientific scope

Local operations coordinated by classical messages can distill fewer high-quality entangled pairs from many imperfect two-qubit pairs whose singlet fidelity exceeds one half. The work introduces two-way recurrence purification and seeded asymptotic breeding, providing entanglement that can support faithful teleportation across a noisy link. Fidelity above one half is sufficient for this two-qubit protocol, not a complete higher-dimensional distillability criterion. Fixed-block recurrence alone has vanishing yield in the perfect-output limit; the positive-rate construction adds variable blocks and breeding resources. The later unseeded one-way hashing protocol is a separate contribution. Ideal local operations and classical messages are assumed; optimal yield is not determined.

Evidence

The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. Fidelity above one half is sufficient for this two-qubit protocol, not a complete higher-dimensional distillability criterion. Fixed-block recurrence alone has vanishing yield in the perfect-output limit; the positive-rate construction adds variable blocks and breeding resources. The later unseeded one-way hashing protocol is a separate contribution. Ideal local operations and classical messages are assumed; optimal yield is not determined.

Contributors

• The named authors in the research record · SCIENCE: The original named human researchers developed the exact mathematical construction or framework. Composite source families retain separate original paper bylines and predecessor roles; they are not a fictional joint publication. Individual effort shares, person identity joins and nationalities are not inferred. The source reading is not independent proof certification.

• Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels

Provisional WRS assessment, edition 2026-10-23.9. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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