The National Institute of Standards and Technology (NIST) has demonstrated error-free quantum communication by pairs of entangled atoms, promising secure quantum computers. Entanglement is a quantum phenomenon in which two particles take on identical internal states in close proximity. If conditions are right, the synchronization persists even after the particles become separated, enabling the quantum information processed by one member of the pair to be simultaneously processed by the other. Now NIST has demonstrated a method that lets entangled atoms communicate information nondestructively, potentially enabling long quantum calculations in which intermediate results could be obtained without disturbing their quantum states. The algorithm traps charged ions in four electromagnetic traps spaced only a few microns apart on the surface of a chip. Ultraviolet lasers then entangle two pairs of ions.