Robust self-testing of steerable quantum assemblages and its applications on device-independent quantum certification

Shin-Liang Chen; Huan-Yu Ku; Wenbin Zhou; Jordi Tura; Yueh-Nan Chen

doi:10.22331/q-2021-09-28-552

Robust self-testing of steerable quantum assemblages and its applications on device-independent quantum certification

Shin-Liang Chen^1,2,3, Huan-Yu Ku¹, Wenbin Zhou⁴, Jordi Tura^3,5, and Yueh-Nan Chen¹

¹Department of Physics and Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 701, Taiwan
²Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany
³Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany
⁴Graduate School of Informatics, Nagoya University, Chikusa-ku, 464-8601 Nagoya, Japan
⁵Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands

Published:	2021-09-28, volume 5, page 552
Eprint:	arXiv:2002.02823v3
Doi:	https://doi.org/10.22331/q-2021-09-28-552
Citation:	Quantum 5, 552 (2021).

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Abstract

Given a Bell inequality, if its maximal quantum violation can be achieved only by a single set of measurements for each party or a single quantum state, up to local unitaries, one refers to such a phenomenon as self-testing. For instance, the maximal quantum violation of the Clauser-Horne-Shimony-Holt inequality certifies that the underlying state contains the two-qubit maximally entangled state and the measurements of one party contains a pair of anti-commuting qubit observables. As a consequence, the other party automatically verifies the set of states remotely steered, namely the "assemblage", is in the eigenstates of a pair of anti-commuting observables. It is natural to ask if the quantum violation of the Bell inequality is not maximally achieved, or if one does not care about self-testing the state or measurements, are we capable of estimating how close the underlying assemblage is to the reference one? In this work, we provide a systematic device-independent estimation by proposing a framework called "robust self-testing of steerable quantum assemblages". In particular, we consider assemblages violating several paradigmatic Bell inequalities and obtain the robust self-testing statement for each scenario. Our result is device-independent (DI), i.e., no assumption is made on the shared state and the measurement devices involved. Our work thus not only paves a way for exploring the connection between the boundary of quantum set of correlations and steerable assemblages, but also provides a useful tool in the areas of DI quantum certification. As two explicit applications, we show 1) that it can be used for an alternative proof of the protocol of DI certification of all entangled two-qubit states proposed by Bowles et al., and 2) that it can be used to verify all non-entanglement-breaking qubit channels with fewer assumptions compared with the work of Rosset et al.

► BibTeX data

@article{Chen2021robustselftestingof,
  doi = {10.22331/q-2021-09-28-552},
  url = {https://doi.org/10.22331/q-2021-09-28-552},
  title = {Robust self-testing of steerable quantum assemblages and its applications on device-independent quantum certification},
  author = {Chen, Shin-Liang and Ku, Huan-Yu and Zhou, Wenbin and Tura, Jordi and Chen, Yueh-Nan},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {5},
  pages = {552},
  month = sep,
  year = {2021}
}

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