A1 Journal article (refereed)
Experimental snapshot verification of non-Markovianity by quantum probing of convex coefficients (2022)

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

JYU authors or editors

Lyyra, Henri

Publication details

All authors or editors: Lyyra, Henri; Siltanen, Olli; Piilo, Jyrki; Banerjee, Subhashish; Kuusela, Tom

Journal or series: Physical Review A

ISSN: 2469-9926

eISSN: 2469-9934

Publication year: 2022

Publication date: 06/09/2022

Volume: 106

Issue number: 3

Article number: 032603

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevA.106.032603

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/83655

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2107.07876

Abstract

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.

Keywords: quantum physics; quantum information; photons; polarisation

Fields of science: