Nonclassicality of squeezed number states

Nonclassicality is a useful quantum resource in quantum information and has important applications in various quantum tasks such as quantum computing, quantum communication. The robustness of nonclassicality is used to quantify the nonclassicality. The nonclassicality of number states, squeezed states and cat states has been known. We consider the nonclassicality of the squeezed number states. Several different upper and lower bounds for the nonclassicality of squeezed single photon state are obtained through analytical calculation, modeling analysis and numerical calculation. By comparing all these bounds, we find that the nonclassicality of squeezed single photon state can be well determined.