Entanglement generation by fock-state filtration

K. J. Resch, J. L. O'Brien, T. J. Weinhold, K. Sanaka, B. P. Lanyon, N. K. Langford, A. G. White

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
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We demonstrate a Fock-state filter which is capable of preferentially blocking single photons over photon pairs. The large conditional nonlinearities are based on higher-order quantum interference, using linear optics, an ancilla photon, and measurement. We demonstrate that the filter acts coherently by using it to convert unentangled photon pairs to a path-entangled state. We quantify the degree of entanglement by transforming the path information to polarization information; applying quantum state tomography we measure a tangle of T=(20±9)%.

Original languageEnglish
Article number203602
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 16 May 2007
Externally publishedYes


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