Quantifying Quantumness of Channels Without Entanglement

0565168 - FZÚ 2023 RIV US eng J - Journal Article
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
Institutional support: RVO:68378271
Keywords : quantifying quantumness of channels * complementary tests of macrorealism * temporal separability * channel unsteerability * temporal unsteerability
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 9.7, year: 2022
Method of publishing: 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.
Permanent Link: https://hdl.handle.net/11104/0336674