The image is an artist’s concept of quantum entanglement between two atoms. A new paper from a group at the University of Oxford – led by quantum physicist Chiara Marletto and published in October in the Journal of Physics Communications – claims the successful entanglement of bacteria with photons (particles of light). Analysing a 2016 experiment conducted by David Coles et al from the University of Sheffield, several hundred photosynthetic green sulphur bacteria were placed between two mirrors, separated by a few hundred nanometers - less than the width of a human hair. By bouncing white light between the mirrors, the photosynthetic molecules within six bacteria coupled; the bacteria would continuously absorb, emit and reabsorb the bouncing photons. Marletto et al argue that the bacteria’s photosynthetic systems become entangled with the light inside the cavity. It appears that certain photons were simultaneously hitting and missing photosynthetic molecules within the bacteria – a hallmark of entanglement. Image source: https://www.scientificamerican.com/article/schroedingers-bacterium-could-be-a-quantum-biology-milestone