Quantum-state engineering with continuous-variable postselection
Andrew M. Lance, Hyunseok Jeong, Nicolai B. Grosse, Thomas Symul, Timothy C. Ralph, Ping Koy Lam · Physical Review A · 2006
We 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.