Amplification of optical Schrödinger cat states with an implementation protocol based on a frequency comb

We proposed and analyzed a scheme to generate large-size Schr\"odinger cat states based on linear operations of Fock states, squeezed vacuum conditional measurements. By conducting measurements via photon number detectors, two unbalanced small-amplitude kitten combined by beam splitter can be amplified state with the same parity. According simulation results, odd amplitudes $|\ensuremath{\beta}|=1.06$ $|\ensuremath{\beta}|=1.11$ generated from one-photon-subtracted 3 dB are an $|\ensuremath{\beta}|=1.73$ fidelity $F=99%$. A $|\ensuremath{\beta}|=2.51$ $F=97.30%$ is predicted when 5.91 employed. analysis impacts experimental imperfections in practice, $|\ensuremath{\beta}|>2$ available. feasible configuration quantum frequency comb developed realize generation we proposed.