Quantum metrology with cold atomic ensembles Morgan W. Mitchell, R. J. Sewell, M. Napolitano, M. Koschorreck, B. Dubost, N. Behbood and M. Kubasik EPJ Web of Conferences, 57 (2013) 03004 Published online: 30 August 2013 DOI: 10.1051/epjconf/20135703004