Entanglement preservation over arbitrary distances in quantum repeater networks is possible if and only if the channel has a correctable subspace, with parallel channel uses needing logarithmic scaling otherwise.
Krisnanda, Distribution of quantum entanglement: Principles and applications (2020), arXiv:2003.08657 [quant-ph]
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Midpoint source placement optimizes entanglement distribution over noisy qubit channels, with SDP showing weakly entangled inputs maximize negativity for amplitude damping and depolarizing noise.
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Asymptotic Limits of Entanglement Distribution
Entanglement preservation over arbitrary distances in quantum repeater networks is possible if and only if the channel has a correctable subspace, with parallel channel uses needing logarithmic scaling otherwise.
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Optimizing entanglement distribution via noisy quantum channels
Midpoint source placement optimizes entanglement distribution over noisy qubit channels, with SDP showing weakly entangled inputs maximize negativity for amplitude damping and depolarizing noise.