Abstract
Recently, Song et al.1 showed that the superposition of macroscopic quantum states, commonly referred to as Schrodinger cats, can be generated via quantum measurement. The apparatus they proposed is shown schematically in Fig. 1, where two light beams A and B with nonclassical phase-quadrature correlations are first generated by a backaction evasion apparatus, such as that demonstrated by La Porta et al.2
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