Preprint
Sep 2026
Full-Rank Noise Forbids Long-Range Entanglement Swapping
Quantum repeaters extend entanglement by swapping noisy elementary links. We prove that full-rank noise forbids this at long range: for any entangled full-rank two-qubit link, there is a finite depth beyond which no end-to-end entanglement can be established regardless of the measurement outcomes on intermediate qubits...
Xuan Du Trinh, Nicholas Pardave, Angie Huang et al.
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