| Popis: |
Interferometers have established themselves as good phase sensitivity estimators, although passive interferometers (those characterized by the SU(2) group) are bounded by the shot noise limit. If we want to overcome this boundary without having to engineer light states such as squeezed or N00N states, we have to work with active interferometers (described by the SU(1,1) group). In this work we will approach the problem from a theoretical point of view and see how we can reach best the restriction set by estimation theory. In order to be closer to an experimental scheme, we had proposed a multi-mode approximation as well as a 2f-system as part of the detection system of the signal photons. |
