A1 Refereed original research article in a scientific journal
Experimental quantum probing measurements with no knowledge of the system-probe interaction
Authors: Henri Lyyra, Olli Siltanen, Jyrki Piilo, Subhashish Banerjee, Tom Kuusela
Publisher: AMER PHYSICAL SOC
Publication year: 2020
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Article number: ARTN 022232
Volume: 102
Issue: 2
Number of pages: 8
ISSN: 2469-9926
eISSN: 2469-9934
DOI: https://doi.org/10.1103/PhysRevA.102.022232(external)
Web address : https://doi.org/10.1103/PhysRevA.102.022232(external)
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/50541756(external)
In any natural science, measurements are the essential link between theory and observable reality. Is it possible to obtain accurate and relevant information via measurement whose action on the probed system is unknown? In other words, can one be convinced to know something about the nature without knowing in detail how the information was obtained? In this paper, we show that the answer is, surprisingly, yes. We construct and experimentally implement a quantum optical probing measurement where measurements on the probes, i.e., the photons' polarization states, are used to extract information on the systems, i.e., the frequency spectra of the same photons. Unlike the preexisting probing protocols, our measurement does not require any knowledge of the interaction between the probe and the system.
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