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Spatially distributed multipartite entanglement enables EPR steering of atomic clouds
Philipp Kunkel1, Maximilian Prüfer2, Helmut Strobel2
1Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany. steering@matterwave.de.
Science (New York, N.Y.)
|April 28, 2018
Summary
We generated and spatially distributed entanglement in ultracold atoms using spin mixing. This confirmed genuine multipartite entanglement and demonstrated Einstein-Podolsky-Rosen steering in distributed quantum systems.
Area of Science:
- Quantum physics
- Atomic physics
- Quantum information science
Background:
- Entanglement between spatially separated modes is crucial for distributed quantum-enhanced protocols.
- Robust generation and detection of such entanglement in ultracold atomic systems present significant challenges.
Purpose of the Study:
- To generate and spatially distribute entanglement in an ultracold atomic system.
- To experimentally confirm genuine multipartite entanglement and demonstrate quantum correlations.
Main Methods:
- Utilized spin mixing in a confined Bose-Einstein condensate to create an entangled state.
- Employed self-similar expansion of the atomic cloud to distribute entanglement spatially.
- Applied spatially resolved spin read-out to detect quantum correlations.
Main Results:
- Successfully generated an entangled state of indistinguishable particles within a single spatial mode.
- Demonstrated spatial distribution of entanglement via atomic cloud expansion.
- Observed strong Einstein-Podolsky-Rosen (EPR) steering between distinct parts of the cloud.
- Confirmed genuine 5-partite entanglement using an EPR steering-based witness.
Conclusions:
- Developed a method for generating and distributing entanglement in ultracold atoms.
- Showcased EPR steering as a powerful tool for verifying multipartite entanglement in spatially separated systems.
- Paved the way for robust distributed quantum protocols using ultracold atomic platforms.
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