Creation of macroscopic quantum superposition states by a measurement

摘要

We propose a novel protocol for the creation of macroscopic quantumsuperposition (MQS) states based on a measurement of a non-monotonous functionof a quantum collective variable. The main advantage of this protocol is thatit does not require switching on and off nonlinear interactions in the system.We predict this protocol to allow the creation of multiatom MQS by measuringthe number of atoms coherently outcoupled from a two-component (spinor)Bose-Einstein condensate.