Experimental ancilla-assisted phase estimation in a noisy channel

Marco Sbroscia, Ilaria Gianani, Emanuele Roccia, Zixin Huang, Lorenzo Maccone, Chiara Macchiavello, Marco Barbieri

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The metrological ability of carefully designed probes can be wrecked by the presence of noise which alters their evolution, reducing the information on the parameter of interest. This spoils the signal-to-noise ratio of any possible measurement. Here we show an experiment in which the introduction of an ancilla improves the estimation of an optical phase with respect to a standard single-qubit strategy. The advantage originates from the coherent coupling of the probe and the ancilla both at the initialization and measurement stages, generating and selecting a subset of overall configurations less affected by the noise.
Original languageEnglish
Article number032305
Pages (from-to)032305-1-032305-7
Number of pages7
JournalPhysical Review A: covering atomic, molecular, and optical physics and quantum information
Issue number3
Publication statusPublished - Mar 2018
Externally publishedYes


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