Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 7: Precision Measurements and Metrology I
Q 7.6: Talk
Monday, March 8, 2010, 15:15–15:30, M 11
Entanglement and precision measurements with states of a fluctuating number of particles — •Philipp Hyllus1, Augusto Smerzi1, and Luca Pezze2 — 1BEC-CNR-INFM and Dipartimento di Fisica, Università di Trento, I-38050 Povo, Italy — 2Laboratoire Charles Fabry, Institut d’Optique, 2 Avenue Fresnel, 91127 Palaiseau - France
For linear interferometers operating with states with a fluctuating number of particles, we define the shot-noise limit and the ultimate limit allowed by quantum mechanics, the so-called Heisenberg limit, taking into account properly the number m of single measurement runs that a phase-estimation experiment consists of. We discuss the relation between sub shot-noise sensitivity and entanglement of the particles and generalize the spin-squeezing parameter of [D.J. Wineland, et al., Phys. Rev. A 50, 67 (1994)] to the case of non-fixed N.