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We analyze a quantum nondemolition measurement scheme similar to that advocated by Song, Caves, and Yurke Phys. Rev. A 41, 5261 (1990) for generating superpositions of macroscopically distinct quantum states, but with the parametric amplifier and the back-action evader interchanged. We determine the asymptotic behavior of the output and obtain the conditions under which a superposition of two coherent states is approached. By presqueezing the signal port input, we find that gain requirements of the back-action evader are much less demanding.
Yurke et al. (Wed,) studied this question.
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