Birds appear to measure magnetic fields using long-lived quantum coherence

Long-lived spin coherence in proteins found in the eyes of migratory birds could explain how the creatures are able to navigate along the Earth's magnetic field with extraordinary precision. This is the finding of researchers in the UK and Germany, who have created a new realistic model of cryptochrome proteins that is based on advanced simulations of nuclear and electron spins. The team also provides an explanation for how the avian magnetic compass has been optimized by evolution.