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Entanglement Closed the Spectrum-Estimation Bound
An estimator matched the lower bound while unentangled strategies paid an extra factor in dimension.
Summary
An estimator matched the lower bound while unentangled strategies paid an extra factor in dimension.
The paper gives an optimal quantum spectrum-estimation procedure and separates it from unentangled measurements by a factor tied to system dimension. The authors conjecture the unentangled bound is itself optimal; this is a complexity result, not an experimental measurement.
Why it matters
An estimator matched the lower bound while unentangled strategies paid an extra factor in dimension.
Limits and context
- The authors conjecture the unentangled bound is itself optimal; this is a complexity result, not an experimental measurement.
Key claims
An estimator matched the lower bound while unentangled strategies paid an extra factor in dimension.
Qualification: The authors conjecture the unentangled bound is itself optimal; this is a complexity result, not an experimental measurement.
Evidence: source-2026-09-27-021
Sources
- arXiv preprint 2609.30171arXiv · primary research
Corrections
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