Experiment towards continuous-variable entanglement swapping: Highly correlated four-partite quantum state

Details Experiment towards continuous-variable entanglement swapping: Highly correlated four-partite quantum state Experiment towards continuous-variable entanglement swapping: Highly correlated four-partite quantum state

2003-02-10

arxiv.org/abs/quant-ph/0302068v2

Phys. Rev. A 68, 012319 (2003)

Physics

Quantum Physics

9 pages, 10 figures, update of references 9 and 10; minor inconsistency in notation removed; format for units in the figures c

Scientific paper

10.1103/PhysRevA.68.012319

We present a protocol for performing entanglement swapping with intense pulsed beams. In a first step, the generation of amplitude correlations between two systems that have never interacted directly is demonstrated. This is verified in direct detection with electronic modulation of the detected photocurrents. The measured correlations are better than expected from a classical reconstruction scheme. In the entanglement swapping process, a four--partite entangled state is generated. We prove experimentally that the amplitudes of the four optical modes are quantum correlated 3 dB below shot noise, which is due to the potential four--party entanglement.

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