Two-photon states generated from a continuous wave source
Anne E. B. Nielsen, Mølmer, K · CERN Document Server (European Organization for Nuclear Research) · 2006
Conditional preparation of two-photon states from a continuous wave non-degenerate optical parametric oscillator is investigated. We derive the phase space Wigner function for the output state conditioned on two nearby photo detection events, and we maximize its overlap with a two-photon state by varying the temporal output state mode function. In the low intensity limit, we generalize to n-photon state production. We find a simple expression for the conditional output, and from this we determine the optimal output state mode function and n-photon state fidelity.