Preprint
Sep 2026
Quantum time-flip beats adaptive metrology: Asymptotic benefit, activation, and unsimulability
In quantum metrology, adaptive and causal-superposition strategies are proven to be beneficial over parallel schemes for a finite number of channel uses, but their advantages disappear in the asymptotic limit. We show that quantum operations with indefinite time direction, specifically, time-flip (TF)-assisted strategi...
Gaurang Agrawal, Pritam Halder, A. De
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