Physics – Quantum Physics
Scientific paper
2004-07-03
Phys. Rev. Lett. 93, 250503 (2004)
Physics
Quantum Physics
new version
Scientific paper
10.1103/PhysRevLett.93.250503
The unconditional entanglement swapping for continuous variables is experimentally demonstrated. Two initial entangled states are produced from two nondegenerate optical parametric amplifiers operating at deamplification. Through implementing the direct measurement of Bell-state between two optical beams from each amplifier the remaining two optical beams, which have never directly interacted with each other, are entangled. The quantum correlation degrees of 1.23dB and 1.12dB below the shot noise limit for the amplitude and phase quadratures resulting from the entanglement swapping are straightly measured.
Gao Jiangrui
Jia* Xiaojun
Pan Qing
Peng Kunchi
Su Xiaolong
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