Quantum state truncation using an optical parametric amplifier and a beam splitter

We present a scheme of quantum state truncation in the Fock basis (quantum scissors), based on combined action nondegenerate optical parametric amplifier and beamsplitter. Differently from previously proposed linear-optics-based scissors devices, which depend reliable states sources, our requires only readily available Gaussian states, such as coherent inputs (vacuum included). A truncated is generated after performing photodetections global state. find that, depending output ports each two photodetectors positioned, different types may be produced: i) having maximum number $N$, or ii) minimum $N$. In order to illustrate method, we discuss an example input beamsplitter vacuum amplifier, show that resulting display nonclassical properties, sub-Poissonian statistics squeezing. quantify nonclassicality degree using Wigner-Yanase skew information measure. For complementarity, efficiency protocol, e.g., generation probability well effects imperfections detector's dark counts rate.