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Advancing our understanding of non-trivial quantum effects in biomolecularcomplexes operating in physiological conditions requires the precisecharacterisation of the non-classicalities that may be present in such systemsas well as asserting whether such features are required for robust function.Here we consider an avian-inspired quantum magnetic sensor composed of tworadicals with a third "scavenger" radical under the influence of a collisionalenvironment that allows to capture a variety of decoherence processes. We showthat basis-independent coherence, in which the initial system-environment stateis non-maximally mixed, is necessary for optimal performance of the quantummagnetic sensor, and appears to be sufficient in particular situations. Wediscuss how such non-maximally mixed initial states may be common for a varietyof biomolecular scenarios. Our results therefore suggest that a small degree ofcoherence--regardless of basis--is likely to be a quantum resource forbiomolecular systems operating at the interface between the quantum andclassical domains.

Basis-independent system-environment coherence is necessary to detect magnetic field direction in an avian-inspired quantum magnetic sensor