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.
Xu et al., Magnetic sensitivity of cryptochrome 4 from a migratory songbird , Nature 594, 535–540 (2021)
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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.