Absorption at boundaries in discrete-time quantum walks yields complementary classical Fisher information on the coin state, so two binary readouts generically give a full-rank Fisher matrix and tight Cramér-Rao bounds without mode-resolved tomography.
Cram´ er,Mathematical Methods of Statistics (Princeton Uni- versity Press, Princeton, NJ, 1946)
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Absorption-based qubit estimation in discrete-time quantum walks
Absorption at boundaries in discrete-time quantum walks yields complementary classical Fisher information on the coin state, so two binary readouts generically give a full-rank Fisher matrix and tight Cramér-Rao bounds without mode-resolved tomography.