Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Gases (Bosons) V

Q 50.3: Vortrag

Mittwoch, 7. März 2018, 14:30–14:45, K 2.020

Entanglement between two spatially separated atomic modes — •Alexander Idel¹, Karsten Lange¹, Jan Peise¹, Bernd Lücke¹, Ilka Kruse¹, Guiseppe Vitagliano^2,3, Iagoba Apellaniz³, Matthias Kleinmann¹, Géza Tóth^3,4,5, and Carsten Klempt¹ — ¹Institut für Quantenoptik, Leibniz Universität Hannover — ²Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences — ³Department of Theoretical Physics, University of the Basque Country UPV/EHU — ⁴IKERBASQUE, Basque Foundation for Science — ⁵Wigner Research Centre for Physics, Hungarian Academy of Sciences

Large ensembles of ultra-cold atoms offer the possibility to generate an unprecedented level of multi-particle entanglement. However, the creation relies on the fundamental indistinguishability of the particles. Entanglement between spatially addressable systems is required for most applications in the field of quantum information. We employ spin changing collisions in a ⁸⁷Rb BEC to generate entanglement. By utilizing the natural mode structure of the spin resonances we show entanglement between two spatially separated modes. We prove the entanglement between the modes with a novel criterion, which accounts for imperfections of the state preparation, e.g. varying atom numbers in our condensate and the imperfect symmetry of the state.