Related papers: Using adaptiveness and causal superpositions against noise in quantum metrology

Using adaptiveness and causal superpositions against noise in quantum metrology

URL: http://arxiv.org/abs/2212.08106v1
Date: Thu, 15 Dec 2022 19:43:24 GMT
Title: Using adaptiveness and causal superpositions against noise in quantum metrology
Authors: Stanislaw Kurdzialek, Wojciech Gorecki, Francesco Albarelli, Rafal Demkowicz-Dobrzanski
Abstract summary: We derive new bounds on achievable precision in the most general adaptive quantum metrological scenarios. The bounds are proven to be saturable and equivalent to the known parallel scheme bounds in the limit of large number of channel uses.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We derive new bounds on achievable precision in the most general adaptive quantum metrological scenarios. The bounds are proven to be asymptotically saturable and equivalent to the known parallel scheme bounds in the limit of large number of channel uses. This completely solves a long standing conjecture in the field of quantum metrology on asymptotic equivalence between parallel and adaptive strategies. The new bounds also allow to easily assess the potential benefits of invoking the non-standard causal superposition strategies, for which we prove, similarly to the adaptive case, the lack of asymptotic advantage over the parallel ones.

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