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The Record Is Separable; the Reading Is Not
Long-range information stored without entanglement can still demand an entangled measurement to recover it.
Summary
Long-range information stored without entanglement can still demand an entangled measurement to recover it.
A theoretical construction lets local qubit probes record neighboring Ising-spin relationships in a fully separable state. For a range of probe overlaps, every separable readout—including local operations with classical communication—falls toward chance as the distance between target spins grows. A joint readout of the same record stays a fixed amount above chance over an overlapping parameter range. The result separates how quantum information is stored from what kind of measurement is needed to extract it.
Why it matters
Long-range information stored without entanglement can still demand an entangled measurement to recover it.
Limits and context
No additional limitation was separately recorded.
Key claims
Long-range information stored without entanglement can still demand an entangled measurement to recover it.
Evidence: source-2026-11-11-016
Sources
- arXiv:2611.14295v1arXiv / Cornell University · primary research
Corrections
No corrections have been recorded for this story.