A Bose-Einstein condensate of metastable helium for quantum correlation experiments

Author(s): M. Keller, M. Kotyrba, F. Leupold, M. Singh, M. Ebner, A. Zeilinger

Journal: Phys. Rev. A

Volume: 90

Page(s): 1406.1322

Year: 2014

DOI Number: 10.1103/PhysRevA.90.063607

Link: Link to publication


We report on the realization of Bose-Einstein condensation of metastable helium-4. After exciting helium to its metastable state in a novel pulse-tube cryostat source, the atomic beam is collimated and slowed. We then trap several 10^8 atoms in a magneto-optical trap. For subsequent evaporative cooling, the atoms are transferred into a magnetic trap. Degeneracy is achieved with typically a few 10^6 atoms. For detection of atomic correlations with high resolution, an ultra-fast delay-line detector has been installed. Consisting of four quadrants with independent read-out electronics that allow for true simultaneous detection of atoms, the detector is especially suited for quantum correlation experiments that require the detection of correlated subsystems. We expect our setup to allow for the direct demonstration of momentum entanglement in a scenario equivalent to the EPR gedankenexperiment. This will pave the way to matter-wave experiments exploiting the peculiarities of quantum correlations.

Note: http://arxiv.org/abs/1406.1322

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