Conditional quantum-state engineering using ancillary squeezed-vacuum states
Hyunseok Jeong, Andrew M. Lance, Nicolai B. Grosse, Thomas Symul, Ping Koy Lam, Timothy C. Ralph · Physical Review A · 2006
We investigate an optical scheme to conditionally engineer quantum states using a beam splitter, homodyne detection, and a squeezed vacuum as an ancillar state. This scheme is efficient in producing non-Gaussian quantum states such as squeezed single photons and superpositions of coherent states (SCSs). We show that a SCS with well defined parity and high fidelity can be generated from a Fock state of $n\ensuremath{\leqslant}4$, and conjecture that this can be generalized for an arbitrary $n$ Fock state. We describe our experimental demonstration of this scheme using coherent input states and measuring experimental fidelities that are only achievable using quantum resources.