https://doi.org/10.1140/epjp/s13360-023-04805-5
Regular Article
Robustness of nonclassicality for superposed two coherent states
1
College of Information and Electronic Engineering, Zhejiang Gongshang University, 310018, Hangzhou, China
2
School of Information and Electrical Engineering, Hangzou City University, 310015, Hangzhou, China
Received:
28
October
2022
Accepted:
18
December
2023
Published online:
4
January
2024
In quantum resource theory, quantifying the nonclassicality of a quantum optical state is of fundamental interest. A basic topic is the nonclassicality of the superposition of two coherent states including cat states. The robustness of nonclassicality for even cat states is known. The problem of the robustness of nonclassicality for odd cat states is not completely solved. We introduce a new method to solve this problem. For the unequal real amplitude cat state, we show that the robustness of nonclassicality can be dealt with as in the case of even and odd cat states. While for the superposition of two coherent states with complex amplitude, we find the upper and lower bounds of robustness of nonclassicality are not equal. Our analysis gives the direction of future work.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
