A fidelity asymmetry tolerance of roughly 0.076 marks the point beyond which entanglement purification becomes counterproductive in quantum networks, and conditioning purification decisions on measured asymmetry improves end-to-end performance.
Exact rate anal- ysis for quantum repeaters with imperfect memories and entanglement swapping as soon as possible
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To Purify or Not to Purify: Entanglement Purification under Input Fidelity Asymmetry in Quantum Networks
A fidelity asymmetry tolerance of roughly 0.076 marks the point beyond which entanglement purification becomes counterproductive in quantum networks, and conditioning purification decisions on measured asymmetry improves end-to-end performance.