Eike Nicklas

TL;DR: It is shown experimentally that the classical precision limit can be surpassed using nonlinear atom interferometry with a Bose–Einstein condensate and the results provide information on the many-particle quantum state, and imply the entanglement of 170 atoms.

TL;DR: The results suggest that the internal bosonic Josephson effect in a rubidium spinor Bose-Einstein condensate is a model system which can be tuned from classical to the quantum regime and thus is an important step towards the experimental investigation of entanglement generation close to critical points.

TL;DR: The realization of an atomic analogue to homodyne detection for the measurement of matter-wave quadratures and the application of this technique to a quantum state produced by spin-changing collisions in a Bose–Einstein condensate reveals continuous-variable entanglement, as well as the twin-atom character of the state.

TL;DR: In this article, the experimental observation of scaling in the time evolution following a sudden quench into the vicinity of a quantum critical point is reported. But the experimental system, a two-component Bose gas with coherent exchange between the constituents, allows for the necessary high level of control of parameters as well as the access to time-resolved spatial correlation functions.

TL;DR: The observed amplitude reduction of the Rabi oscillations can be understood as a result of demixing dynamics of dressed states as experimentally confirmed by reconstructing the spatial profile of dressed state amplitudes.