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

Abstract

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.

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

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• Witnessing Entanglement with Second-Order Interference
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• Entanglement in the bimodal Jaynes-Cummings model with the two-mode squeezed vacuum state
• Structure of the Phase in Pure Two-Mode Gaussian States
• Local-available quantum correlation swapping in one-parameter X states