Abstract: The superposition of two excited coherent states with identical intensity and different phases are constructed. Its antibunching effect and amplitude-squared squeezing are studied numerically. The result shows that as the light intensity and the excited photon number increase, the antibunching effect decreases and the amplitude-squared squeezing increases. The amplitude-squared squeezing is influenced by the phase difference.

Key words: excited coherent state, superposion state, antibunching effect, amplitude-squared squeezing