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We show that the asymptotic state of a quantum system composed of two atomsin circular motion in vacuum can be entangled when the angular velocity and theradius of the orbit are appropriate. The asymptotic entanglement as a result ofcentripetal acceleration is initial-state independent and can be viewed as amanifestation of the circular version of the Unruh effect. Based on thisphenomenon, we propose an optomechanical setup to detect the circular Unruheffect with the state-of-the-art technologies.

Detecting circular Unruh effect with quantum entanglement