Livescience.com: 'Spooky action at a distance' could create a nearly perfect clo
ck.
[1]https://www.livescience.com/quantum-entanglement-atomic-clock.html

   Alice + Bob + Charlie + Debbie

   (Bob and Carol and Ted and Alice.)

References

   1. https://www.livescience.com/quantum-entanglement-atomic-clock.html