Superposition of two coherent states, the Schrodinger’s cat state, can exhibit different nonclassical properties having foundational applications in quantum information processing. We consider the ‘superposition of Schrodinger’s cat state with the vacuum state (SCVS)’ of the optical field. We discuss different witness of nonclassicality properties such as lower- and higher-order squeezing (viz., squeezing, Hong & Mandel’s fourth-order squeezing, amplitude-squared squeezing) and sub-Poissonian photon statistics. Further, we discuss the negativity of the Wigner function of SCVS indicating the nonclassicality of the state under investigation. We find that the vacuum state contribution in SCVS exhibits different nonclassicalities under some conditions stronger where the nonclassicalities exhibited by the state without vacuum state contribution are weaker.

薛定inger的猫态这两个相干态的叠加可以表现出不同的非经典性质，在量子信息处理中具有基础性的应用。我们考虑光场的“薛定inger猫状态与真空状态（SCVS）的叠加”。我们讨论了非经典性质的不同见证人，例如低阶和高阶压缩（即，压缩，Hong＆Mandel的四阶压缩，振幅平方压缩）和次泊松光子统计。此外，我们讨论了SCVS的Wigner函数的负性，表明所研究状态的非经典性。