IQIS2009: Italian Quantum Information Science Conference 2009
timetable:
Sun 8 Nov, 10:00 - 10:30, Aula Bianchi Scienze
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Entanglement, Non-linear Dynamics and Heisenberg Limit
speaker: Augusto Smerzi (CNR e dipartimento di Fisica, Trento)abstract: We show that the quantum Fisher information provides a sufficient condition to recognize multi-particle entanglement in a $N$ qubit state. The same criterion gives a necessary and sufficient condition for sub shot-noise phase sensitivity in the estimation of a collective rotation angle $\theta$. The analysis therefore singles out the class of entangled states which are {\it useful} to overcome classical phase sensitivity in metrology and sensors. We apply our results to study the creation of useful entangled states by the non-linear dynamical evolution of two decoupled Bose-Einstein condensates or with ions trapped in periodic potentials. reference: Luca Pezzé and Augusto Smerzi, Phys. Rev. Lett. 102, 100401 (2009)
timetable:
Sun 8 Nov, 10:00 - 10:30, Aula Bianchi Scienze
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