The heralded optical parametric amplifier (OPA) has emerged as a promising tool for quantum state engineering. However, its potential has so far been limited to coherent state inputs. Here we introduce a generalized heralded OPA protocol that unlocks a vastly expanded class of quantum phenomena by accepting arbitrary nonclassical inputs. With a squeezed vacuum input, the setup functions as an integrated two-photon subtractor, nondeterministically generating high-fidelity, larger-amplitude squeezed Schrödinger cat (SC) states, an operation previously requiring complex, discrete setups. Furthermore, when fed a small-amplitude SC state, the protocol acts as a non-Gaussianity amplifier, distilling it into high-purity approximations of key quantum resources like specific photon-number superpositions. This work transforms the OPA from a specialized source into a versatile platform for advanced quantum state engineering. The integrated setup enables the generation of a wide array of non-Gaussian states, providing a unified approach to quantum state synthesis.

Close

PrevNext

View figure in article

• Quantum optics