State Preparation by Photon Filtering
Giacomo Mauro D’Ariano, Lorenzo Maccone, Matteo G. A. Paris, Massimiliano Federico Sacchi · Fortschritte der Physik · 2000
We propose a setup capable of generating Fock states of a single mode radiation field. The scheme is based on coupling the signal field to a ring cavity through cross-Kerr phase modulation, and on conditional ON-OFF photodetection at the output cavity mode. The same setup allows to prepare selected superpositions of Fock states and entangled two-mode states. Remarkably, the detector's quantum efficiency does not affect the reliability of the state synthesis.