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The metrological ability of carefully designed probes can be spoilt by thepresence of noisy processes occurring during their evolution. The noise isresponsible for altering the evolution of the probes in such a way that bearlittle or no information on the parameter of interest, hence spoiling thesignal-to-noise ratio of any possible measurement. Here we show an experimentin which the introduction of an ancilla improves the estimation of an opticalphase in the high-noise regime. The advantage is realised by the coherentcoupling of the probe and the ancilla at the initialisation and the measurementstate, which generate and then select a subset of overall configurations lessaffected by the noise process.

Experimental ancilla-assisted phase-estimation in a noisy channel