Quantum steering from phase measurements with limited resources
arxiv(2024)
摘要
Quantum steering captures the ability of one party, Alice, to control through
quantum correlations the state at a distant location, Bob, with superior
ability than allowed by a local hidden state model. Verifying the presence of
quantum steering has implications for the certification of quantum channels,
and its connection to the metrological power of the quantum state has been
recently proved. This link is established by means of the violation of a
Cramér-Rao bound holding for non-steerable states: its direct assessment
would then require operation in the asymptotic regime of a large number of
repetitions. Here, we extend previous work to account explicitly for the use of
a limited number of resources, and put this modified approach to test in a
quantum optics experiment. The imperfections in the apparatus demand an
adaptation of the original test in the multiparameter setting. Our results
provide guidelines to apply such a metrological approach to the validation of
quantum channels.
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