In particular, the criterion based on $\bar F$ is able to detect certain bound entangled states. We show that these criteria detect different sets of states and illustrate their strengths by considering several examples, also using experimental data.
#Cold atom quantum coherence pdf#
A 92, 043828 Published 20 October 2015 More PDF HTML Export Citation Abstract We consider an all-optical photon switch in an atomic gas which is gated via a so-called Rydberg spin wave, i.e., a single Rydberg excitation that is coherently shared by the whole ensemble. Building on their exquisite spatial and temporal control, we propose to engineer system-reservoir configurations using box traps, in view of preparing and manipulating topological atomic states in optical lattices. We further compute similar bounds on the average Fisher information $\bar F$ for collective spin operators, where the average is performed over all possible spin directions. Coherence in a cold-atom photon switch Weibin Li and Igor Lesanovsky Phys. Optical box traps for cold atoms offer new possibilities for quantum-gas experiments. These bounds imply that genuine multiparticle entanglement is needed for reaching the highest sensitivities in quantum interferometry. In this work, we go a step further by deducing bounds on $F$ for several multiparticle entanglement classes. As a direct consequence, with such input states the shot-noise limit is the ultimate limit of precision.
der special circumstances, namely for very elongated and cold atomic clouds. It has been shown recently that the Fisher information for a linear two-mode interferometer cannot exceed the number of particles if the input state is separable. a robust atom chip quantum gate and for the coupling of a Bose-Einstein. The Fisher information $F$ gives a limit to the ultimate precision achievable in a phase estimation protocol.
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