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Abstract
In this paper we develop a method for investigating semi-device-independent randomness expansion protocols that was introduced in Li et al. [H.-W. Li, P. Mironowicz, M. Pawłowski, Z.-Q. Yin, Y.-C. Wu, S. Wang, W. Chen, H.-G. Hu, G.-C. Guo, and Z.-F. Han, Phys. Rev. A 87, 020302(R) (2013)]. This method allows us to lower bound, with semi-definite programming, the randomness obtained from random number generators based on dimension witnesses. We also investigate the robustness of some randomness expanders using this method. We show the role of an assumption about the trace of the measurement operators and a way to avoid it. The method is also generalized to systems of arbitrary dimension and for a more general form of dimension witnesses than in our previous paper. Finally, we introduce a procedure of dimension witness reduction, which can be used to obtain from an existing witness a new one with a higher amount of certifiable randomness. The presented methods find an application for experiments [J. Ahrens, P. Badziag, M. Pawlowski, M. Zukowski, and M. Bourennane, Phys. Rev. Lett. 112, 140401 (2014)].
Authors (3)
-
Hong-Wei Li
- University of Science and Technology of China Key Laboratory of Quantum Information
-
Marcin Pawłowski
- Uniwersytet Gdański Instytut Fizyki Teoretycznej i Astrofizyki
Cite as
Full text
- Publication version
- Accepted or Published Version
- License
- Copyright (2014 American Physical Society)
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
PHYSICAL REVIEW A
no. 90,
edition 2,
pages 1 - 13,
ISSN: 2469-9926 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Mironowicz P., Li H., Pawłowski M.: Properties of dimension witnesses and their semidefinite programming relaxations// PHYSICAL REVIEW A. -Vol. 90, iss. 2 (2014), s.1-13
- Verified by:
- Gdańsk University of Technology
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