Family of CV states of definite parity and their metrological power

Abstract We introduce a new family of continuous variable (CV) states definite parity originating from the single mode squeezed vacuum (SMSV) state by subtracting an arbitrary number photons it. A beam splitter with transmittance and reflectance parameters redirects input in indistinguishable manner to output measuring modes followed probabilistic measurement, thereby converting initial SMSV photon distribution into one after we know registered photons. The measurement-induced CV is solely determined parameter which inevitably decreases when generating states. show that quantum engineering subtraction multiphoton can significantly enhance their nonclassical properties (more squeezing, larger value Fisher information) compared they originate, which, combined significant gain brightness, makes them attractive for ultra-precise measurements. potential certain parity, original SMSV, no doubt, belongs, become decisive push implementation optical metrology protocols.