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Quantum metrology with nonclassical states of atomic ensembles
Quantum technologies exploit entanglement to revolutionize computing, measurements, and communications. This has stimulated the research in different areas of physics to engineer and manipulate
Quantum Coherent Atomic Tunneling between Two Trapped Bose-Einstein Condensates
We study the coherent atomic tunneling between two zero-temperature Bose-Einstein condensates (BEC) confined in a double-well magnetic trap. Two Gross-Pitaevskii equations for the self-interacting
Coherent oscillations between two weakly coupled Bose-Einstein condensates: Josephson effects, π oscillations, and macroscopic quantum self-trapping
We discuss the coherent atomic oscillations between two weakly coupled Bose-Einstein condensates. The weak link is provided by a laser barrier in a (possibly asymmetric) double-well trap or by Raman
Fisher information and multiparticle entanglement
Bounds on F imply that genuine multiparticle entanglement is needed for reaching the highest sensitivities in quantum interferometry, and these criteria detect different sets of states and illustrate their strengths by considering several examples.
Discrete solitons and breathers with dilute Bose-Einstein condensates.
The dynamical phase diagram of a dilute Bose-Einstein condensate (BEC) trapped in a periodic potential is studied, pointing out that mean field effects lead to a coherent destruction of the interwell Bloch oscillations.
Not all pure entangled states are useful for sub-shot-noise interferometry
We investigate the connection between the shot-noise limit in linear interferometers and particle entanglement. In particular, we ask whether sub-shot-noise sensitivity can be reached with all pure
Entanglement, nonlinear dynamics, and the heisenberg limit.
The analysis singles out the class of entangled states which are useful to overcome classical phase sensitivity in metrology and sensors and studies the creation of useful entangled states by the nonlinear dynamical evolution of two decoupled Bose-Einstein condensates or trapped ions.
Twin Matter Waves for Interferometry Beyond the Classical Limit
This work used spin dynamics in Bose-Einstein condensates to create large ensembles of up to 104 pair-correlated atoms with an interferometric sensitivity beyond the shot noise limit, and points the way toward a new generation of atom interferometers.
Fisher information and entanglement of non-Gaussian spin states
A general method is developed to extract the Fisher information, which reveals that the quantum dynamics of a classically unstable system creates quantum states that are not spin squeezed but nevertheless entangled, which quantifies metrologically useful entanglement.
Quantum theory of phase estimation
Advancements in physics are often motivated/accompanied by advancements in our precision measurements abilities. The current generation of atomic and optical interferometers is limited by shot noise,