Luis Aina, AlfredoSánchez Soto, Luis Lorenzo2023-06-202023-06-201992-061050-294710.1103/PhysRevA.45.8228https://hdl.handle.net/20.500.14352/59837© 1992 The American Physical Society. We are much indebted to Professor E. Bernabeu for his continual advice and interest in the present work.A multimode quantum analysis of noise reduction in interferometric measurements is presented. A unitary transformation relating the output modes with the input ones for a Michelson interferometer with moving mirrors is given. The evaluation of the noise spectrum shows that with a proper choice of the input states, the sensitivity of the interferometer can be pushed beyond the standard quantum limit. The results are compared with a semiclassical analysis.engjournal articlehttp://dx.doi.org/10.1103/PhysRevA.45.8228http://journals.aps.org/open access535Squeezed statesLimitPositionOpticsFieldsÓptica (Física)2209.19 Óptica Física