Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 28: Quantum Gases (Bosons) III

Q 28.2: Talk

Wednesday, March 13, 2019, 11:00–11:15, S HS 037 Informatik

Revealing entanglement in a spinor BEC by simultaneous and spatially resolved readout of two non-commuting spin observables — •Philipp Kunkel, Maximilian Prüfer, Stefan Lannig, Rodrigo F. Rosa-Medina, Alexis Bonnin, Martin Gärttner, Helmut Strobel, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, Heidelberg

The information that can be extracted from a single projective measurement on a given quantum system is fundamentally limited. Extending the dimension of the original Hilbert space by coupling to auxiliary empty modes and performing unitary transformations in this enlarged space augments the accessible information. We experimentally apply such a scheme to a spinor Bose-Einstein condensate of ⁸⁷Rb in the F=1 hyperfine manifold in a crossed dipole trap. In this system, we generate a many-particle entangled state via spin mixing resonant with specific spatial modes which are selectively addressed. We transfer population to the empty F=2 manifold (auxiliary modes) by microwave coupling and perform independent spin rotations in both subsystems. In this way we get access to two non-commuting spin observables measured in a single shot of the experiment. Exploiting the spatial resolution of our imaging system and the symmetry of the spatial modes we directly extract their respective dynamics. Our measurement technique allows us to reveal the dynamically generated entanglement in the individual modes.