Physics – Quantum Physics
Scientific paper
2005-11-21
Phys. Rev. A. 73, 012306 (2006)
Physics
Quantum Physics
11 pages, 7 figures, to appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.73.012306
Three different methods have been discussed to verify continuous variable entanglement of intense light beams. We demonstrate all three methods using the same set--up to facilitate the comparison. The non--linearity used to generate entanglement is the Kerr--effect in optical fibres. Due to the brightness of the entangled pulses, standard homodyne detection is not an appropriate tool for the verification. However, we show that by using large asymmetric interferometers on each beam individually, two non-commuting variables can be accessed and the presence of entanglement verified via joint measurements on the two beams. Alternatively, we witness entanglement by combining the two beams on a beam splitter that yields certain linear combinations of quadrature amplitudes which suffice to prove the presence of entanglement.
Andersen Ulrik L.
Glöckl Oliver
Leuchs Gerd
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