These Drums Beat in Perfect Synchrony Because They're Quantumly Entangled Alerts Entanglement causes two separated objects to behave as though they are connected, illustrated here as two conga drums twisted around each other. However, as the researchers measure each drum’s position, they appear to act independently—shown here as the two drums’ separated shadows. To confirm the drums are entangled, the researchers must measure the drum position many times and examine the statistics. Illustration: J. Bertram/NIST Physicists have built two tiny drums, each as large as a human hair is wide, and synchronized their vibrations exactly. They achieved this perfect unison of drums using a quantum mechanics phenomenon known as entanglement—and the drums could be useful for developing quantum computers.