  Quantum and biological systems are seldom discussed together as they
seemingly demand opposing conditions. Life is complex, "hot and wet" whereas
quantum objects are small, cold and well controlled. Here, we overcome this
barrier with a tardigrade -- a microscopic multicellular organism known to
tolerate extreme physiochemical conditions via a latent state of life known as
cryptobiosis. We observe coupling between the animal in cryptobiosis and a
superconducting quantum bit and prepare a highly entangled state between this
combined system and another qubit. The tardigrade itself is shown to be
entangled with the remaining subsystems. The animal is then observed to return
to its active form after 420 hours at sub 10 mK temperatures and pressure of
$6\times 10^{-6}$ mbar, setting a new record for the conditions that a complex
form of life can survive.
