J. Esteve, Squeezing and entanglement in a Bose???Einstein condensate, Nature, vol.96, issue.7217, p.1216, 2008.
DOI : 10.1038/nature07332

K. Eckert, Quantum non-demolition detection of strongly correlated systems, Nature Physics, vol.95, issue.1, p.50, 2008.
DOI : 10.1038/nphys776

S. Chaudhury, Quantum Control of the Hyperfine Spin of a Cs Atom Ensemble, Physical Review Letters, vol.99, issue.16, p.163002, 2007.
DOI : 10.1103/PhysRevLett.99.163002

V. Giovannetti, Quantum-Enhanced Measurements: Beating the Standard Quantum Limit, Science, vol.306, issue.5700, p.1330, 2004.
DOI : 10.1126/science.1104149

A. Peres and R. F. Werner, Separability Criterion for Density Matrices, Physical Review Letters, vol.77, issue.8, pp.1413-4277, 1989.
DOI : 10.1103/PhysRevLett.77.1413

G. Toth, Optimal Spin Squeezing Inequalities Detect Bound Entanglement in Spin Models, Physical Review Letters, vol.99, issue.25, p.250405, 2007.
DOI : 10.1103/PhysRevLett.99.250405

D. Ulam-orgikh and M. Kitagawa, Spin squeezing and decoherence limit in Ramsey spectroscopy, Physical Review A, vol.64, issue.5, p.52106, 2001.
DOI : 10.1103/PhysRevA.64.052106

M. Kitagawa and M. Ueda, Squeezed spin states, Physical Review A, vol.47, issue.6, p.5138, 1993.
DOI : 10.1103/PhysRevA.47.5138

S. L. Braunstein and C. M. Caves, Statistical distance and the geometry of quantum states, Physical Review Letters, vol.72, issue.22, p.3439, 1994.
DOI : 10.1103/PhysRevLett.72.3439

C. W. Helstrom, Quantum detection and estimation theory, Journal of Statistical Physics, vol.15, issue.1, 1976.
DOI : 10.1007/BF01007479