RT Journal Article T1 Breaking the Heisenberg limit with inefficient detectors A1 Beltrán, José A1 Luis Aina, Alfredo AB We analyze the performance of nonlinear detection schemes surpassing the Heisenberg limit with semiclassical input states when using realistic detectors having nonunit detection efficiency. PB American Physical Society SN 1050-2947 YR 2005 FD 2005-10-03 LK https://hdl.handle.net/20.500.14352/51499 UL https://hdl.handle.net/20.500.14352/51499 LA eng NO ©2005 The American Physical Society.A.L. thanks Professor J. Dunningham for valuable comments. DS Docta Complutense RD 9 abr 2025