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

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Citation

Glockl, O., Lorenz, S., Marquardt, C., Heersink, J., Brownnutt, M., Silberhorn, C., et al. (2003). Experiment towards continuous-variable entanglement swapping: Highly correlated four-partite quantum state. PHYSICAL REVIEW A, 68(1): 012319. doi:10.1103/PhysRevA.68.012319.


Cite as: https://hdl.handle.net/21.11116/0000-0002-97C4-6
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 an 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 consistent with the presence
of genuine four-party entanglement.