Quantifying Quantumness of Channels Without Entanglement

0565168 - FZÚ 2023 RIV US eng J - Článek v odborném periodiku
Ku, H. - Kadlec, J. - Černoch, Antonín - Quintino, M.T. - Zhou, W. - Lemr, K. - Lambert, N. - Miranowicz, A. - Chen, S.L. - Nori, F. - Chen, Y.
Quantifying Quantumness of Channels Without Entanglement.
PRX QUANTUM. Roč. 3, č. 2 (2022), č. článku 020338. E-ISSN 2691-3399
Institucionální podpora: RVO:68378271
Klíčová slova: quantifying quantumness of channels * complementary tests of macrorealism * temporal separability * channel unsteerability * temporal unsteerability
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 9.7, rok: 2022
Způsob publikování: Open access

Quantum channels breaking entanglement, incompatibility, or nonlocality are defined as such because they are not useful for entanglement-based, one-sided device-independent, or device-independent quantum-information processing, respectively. Here, we show that such breaking channels are related to complementary tests of macrorealism, i.e., temporal separability, channel unsteerability, temporal unsteerability, and the temporal Bell inequality. To demonstrate this we first define a steerability-breaking channel, which is conceptually similar to entanglement and nonlocality-breaking channels and prove that it is identical to an incompatibility-breaking channel. A hierarchy of quantum nonbreaking channels is derived, akin to the existing hierarchy relations for temporal and spatial quantum correlations.
Trvalý link: https://hdl.handle.net/11104/0336674