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Bell correlations in a Bose-Einstein condensate
This work shows that the strongest possible nonclassical correlations are experimentally accessible in many-body systems and that they can be revealed by collective measurements.
Spatial entanglement patterns and Einstein-Podolsky-Rosen steering in Bose-Einstein condensates
High-resolution imaging is used to directly measure the spin correlations between spatially separated parts of a spin-squeezed Bose-Einstein condensate and observes entanglement that is strong enough for Einstein-Podolsky-Rosen steering: The authors can predict measurement outcomes for noncommuting observables in one spatial region on the basis of corresponding measurements in another region with an inferred uncertainty product below the Heisenberg uncertainty bound.
Fast quantum control and light-matter interactions at the 10,000 quanta level
Fast control of quantum systems is essential in order to make use of quantum properties before they are degraded by decoherence. This is important for quantum-enhanced information processing , as…
Metrological complementarity reveals the Einstein-Podolsky-Rosen paradox
This work forms the EPR paradox in the framework of quantum metrology, showing that it enables the precise estimation of a local phase shift and of its generating observable, and derives a criterion based on the quantum Fisher information that detects steering in a larger class of states than well-known uncertainty-based criteria.
Generation of large coherent states by bang–bang control of a trapped-ion oscillator
Here, bang–bang control of a trapped-ion oscillator is demonstrated using nanosecond switching of the trapping potentials, which provides new possibilities for quantum-state manipulation and generation, alongside the potential for a significant increase in operational clock speed for trapped-ions quantum information processing.
Normalized Gaussian path integrals.
A consistent approach to solve conditional and unconditional Euclidean (Wiener) Gaussian path integrals that allow us to compute transition probabilities in the semiclassical approximation from the solutions of a system of linear differential equations.
Bell correlations in a split two-mode-squeezed Bose-Einstein condensate
Xin Meng, ∗ Jonas Kitzinger, 3, ∗ Matteo Fadel, Valentin Ivannikov, Kae Nemoto, William J. Munro, 5 and Tim Byrnes 1, 7, 5, 8, † State Key Laboratory of Precision Spectroscopy, School of Physical and…
Spatial entanglement patterns and Einstein-Podolsky-Rosen steering in a Bose-Einstein condensate
Entanglement between Identical Particles Is a Useful and Consistent Resource
The existence of fundamentally identical particles represents a foundational distinction between classical and quantum mechanics. Due to their exchange symmetry, identical particles can appear to be…
Mesoscopic quantum superpositions in bimodal Bose-Einstein condensates: decoherence and strategies to counteract it
We study theoretically the interaction-induced generation of mesoscopic coherent spin state superpositions (small cat states) from an initial coherent spin state in bimodal Bose-Einstein condensates…