Experimental snapshot verification of non-Markovianity by quantum probing of convex coefficients
Lyyra, H., Siltanen, O., Piilo, J., Banerjee, S., & Kuusela, T. (2022). Experimental snapshot verification of non-Markovianity by quantum probing of convex coefficients. Physical Review A, 106(3), Article 032603. https://doi.org/10.1103/PhysRevA.106.032603
Published inPhysical Review A
DisciplineNanoscience CenterNanoscience Center
©2022 American Physical Society
We apply the recently proposed quantum probing protocols with an unknown system-probe coupling to probe the convex coefficients in mixtures of commuting states. By using two reference states instead of one as originally suggested, we are able to probe both the lower and upper bounds for the convex coefficient. We perform extensive analysis for the roles of the parameters characterizing the double peaked Gaussian frequency spectrum in the Markovian-to-non-Markovian transition of the polarization dynamics of a single photon. We apply the probing of the convex coefficient to the transition-inducing frequency parameter and show that the non-Markovianity of the polarization dynamics can be confirmed with a single snapshot measurement of the polarization qubit performed at unknown time. Furthermore, we change the “known” measurement coupling that corresponds to our dynamics of interest to unknown measurement coupling and show that even for unknown measurement couplings the probing method is precise enough to confirm that using the “known coupling” would lead to non-Markovian polarization dynamics. We also show how the protocol can identify Markovian and non-Markovian time intervals in the dynamics. The results are validated with single-photon experiments. ...
PublisherAmerican Physical Society
ISSN Search the Publication Forum2469-9926
Publication in research information system
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Related funder(s)European Commission
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 852428). O.S. acknowledges the financial support from the Magnus Ehrnrooth Foundation and the University of Turku Graduate School (UTUGS). S.B. acknowledges support from Interdisciplinary Cyber Physical Systems (ICPS) program of the Department of Science and Technology (DST), India, Grant No. DST/ICPS/QuST/Theme-1/2019/6 and also from the Interdisciplinary Program (IDRP) on Quantum Information and Computation (QIC) at IIT Jodhpur. ...
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