Lance, AndrewJeong, HyunseokGrosse, NicolaiSymul, ThomasRalph, Timothy CameronLam, Ping Koy2015-12-071050-2947http://hdl.handle.net/1885/25076We present a scheme to conditionally engineer an optical quantum system via continuous-variable measurements. This scheme yields high-fidelity squeezed single photons and a superposition of coherent states, from input single- and two-photon Fock states, respectively. The input Fock state is interacted with an ancilla squeezed vacuum state using a beam splitter. We transform the quantum system by postselecting on the continuous-observable measurement outcome of the ancilla state. We experimentally demonstrate the principles of this scheme using coherent states and experimentally measure fidelities that are only achievable using quantum resources.Keywords: Continuous-variable postselection; Fidelities; Quantum-state engineering; Two-photon Fock states; Optical beam splitters; Photons; Vacuum; Quantum theory200610.1103/PhysRevA.73.0418012015-12-07