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We discuss a model for interferometric GW antennas without dissipative oractive elements.  It is predicted that the even and odd coherent states may play an alternativerole to squeezed vacuum states in reducing the optimal power of the inputlaser.Comment: LATEX,14 pages,INFN-NA-IV-93/20, DSF-T-93/3

Quantum limits in interferometric gravitational-wave antennas in the presence of even and odd coherent states