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Phys. Rev. A 75, 012313 (2007) [5 pages]

Heralded generation of multiphoton entanglement

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Philip Walther1,*, Markus Aspelmeyer1,2, and Anton Zeilinger1,2
1Institute for Experimental Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria
2Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria

Received 7 June 2006; published 12 January 2007

We present a scheme, based only on linear optics and standard photon detection, that allows to generate heralded multiphoton entangled states of arbitrary photon number from spontaneous parametric downconversion (PDC) in the weak interaction regime. The scheme also works in the strong interaction regime, i.e., for the production of large photon numbers, when photon-number resolving detectors with nearly perfect quantum efficiency are used. In addition, the same setup can be used for quantum metrology as multiphoton interferometer with sensitivity at the Heisenberg limit.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.012313
DOI:
10.1103/PhysRevA.75.012313
PACS:
03.67.Mn, 42.65.Lm, 03.65.Ud

*Present address: Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138.

 
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