Filtering Out Photonic Fock States
Author(s): K. Sanaka, K. J. Resch, A. Zeilinger
Journal: Physical Review Letters
DOI Number: 10.1103/PhysRevLett.96.083601
Link: Link to publication
Unprecedented optical nonlinearities can be generated probabilistically in simple linear-optical networks conditioned on specific measurement outcomes. We describe a highly controllable quantum filter for photon number states, which takes advantage of such a measurement-induced amplitude nonlinearity.
The basis for this filter is multiphoton nonclassical interference which we demonstrate for one- and twophoton states over a wide range of beam splitter reflectivities. Specifically, we show that the transmission probability, conditional on a specific measurement outcome, can be larger for a two-photon state than a one-photon state; this is not possible with linear optics alone.File: Link to PDF