Filtering Out Photonic Fock States

Author(s): K. Sanaka, K. J. Resch, A. Zeilinger

Journal: Physical Review Letters

Volume: 96

Page(s): 083601-1-4

Year: 2006

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.

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