Entanglement generation by Fock-state filtration

Resch, K. J., O'Brien, J. L., Weinhold, T.J., Sanaka, K, Lanyon, B., Langford, N. K. and White, A. G. (2007) Entanglement generation by Fock-state filtration. Physical Review Letters, 98 20: 203602-1-203602-4. doi:10.1103/PhysRevLett.98.203602

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Author Resch, K. J.
O'Brien, J. L.
Weinhold, T.J.
Sanaka, K
Lanyon, B.
Langford, N. K.
White, A. G.
Title Entanglement generation by Fock-state filtration
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2007-05-16
Year available 2007
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.98.203602
Open Access Status File (Publisher version)
Volume 98
Issue 20
Start page 203602-1
End page 203602-4
Total pages 4
Place of publication Ridge, USA
Publisher American Physical Society
Collection year 2008
Language eng
Subject C1
780102 Physical sciences
240402 Quantum Optics and Lasers
0206 Quantum Physics
0205 Optical Physics
Abstract 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)%.
Keyword Photons
Fock-state filter
Linear optics
Q-Index Code C1

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Created: Wed, 02 Apr 2008, 17:28:40 EST by Jenny Robinson on behalf of Faculty of Science