  The physical concept of quantum entanglement is brought to the biological
domain. We simulate the cooperation of two insects by hypothesizing that they
share a large number of quantum entangled spin-1/2 particles. Each of them
makes measurements on these particles to decide whether to execute certain
actions. In the first example, two ants must push a pebble, which may be too
heavy for one ant. In the second example, two distant butterflies must find
each other. In both examples the individuals make odour-guided random choices
of possible directions, followed by a quantum decision whether to push/fly or
to wait. With quantum entanglement the two ants can push the pebble up to twice
as far as independent ants, and the two butterflies may need as little as half
of the flight path of independent butterflies to find each other.
