Schematic of a quantum interferometer model of a chemical compass, as used by birds and other species for navigation. The spin-dependent chemical reaction channels lead to an observable that indicates the direction of the magnetic field.
From the article:
Chemical Compass Model for Avian Magnetoreception as a Quantum Coherent DeviceJianming Cai and Martin B. Plenio
Phys. Rev. Lett. 111, 230503 (2013)
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