Observation of a Time Crystal

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In a delicate balance between strong interactions, weak disorder, and a periodic driving force, a collection of trapped ions qubits has been made to pulsate with a period that is relatively insensitive to the drive. This is a time crystal, where the stable pulses emerge and break time symmetry – just like a freezing liquid breaks spatial symmetry and forms a spatial crystal. Trapped ion qubits can pulsate on their own with excellent passive stability, but this observation may guide the stabilization of complex solid-state systems, where true quantum behavior is usually masked by defects and impurities.