Radical-pair recombination yields in cryptochrome models achieve near-optimal but not fully optimal precision for geomagnetic field sensing compared to quantum Fisher information bounds.
The symmetric logarithmic derivative determines the optimal measurement basis, but leaves open the question of constructing an estimator which saturates the Cram´ er–Rao bound
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On the optimality of the radical-pair quantum compass
Radical-pair recombination yields in cryptochrome models achieve near-optimal but not fully optimal precision for geomagnetic field sensing compared to quantum Fisher information bounds.