Cited by 42Quantum Information and CryptographyQuantum Mechanics and ApplicationsQuantum Computing Algorithms and Architecture

Quantifying Quantumness of Channels Without Entanglement

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Ku, Huan-Yu, Kadlec, Josef, Černoch, Antonín, Quintino, Marco Túlio, Zhou, Wenbin, Lemr, Karel, Lambert, Neill, Miranowicz, Adam +3 more·2022·PRX Quantum

Abstract

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.We then introduce the concept of channels that break temporal correlations, explain how they are related to the standard breaking channels, and prove the following results.(1) A robustness-based measure for non-entanglementbreaking channels can be probed by temporal nonseparability.(2) A non-steerability-breaking channel can be quantified by channel steering.(3) Temporal steerability and nonmacrorealism can be used for, respectively, distinguishing unital steerability-breaking channels and nonlocality-breaking channels for a maximally entangled state.Finally, a two-dimensional depolarizing channel is experimentally implemented as a proof-of-principle example to demonstrate the hierarchy relation of nonbreaking channels using temporal quantum correlations.

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  • Experimental QST-based hierarchies of quantum entanglement, steering, and Bell nonlocality for specific classes of two-qubit states were reported, including experiments with mixtures of partially entangled two-qubit pure states and GWSs based on full QST or full quantum process tomography.

    “Experimental QST-based hierarchies of quantum entanglement, steering, and Bell nonlocality for specific classes of two-qubit states in relation to the above-mentioned estimations were also reported, which include experiments with mixtures of partially entangled two-qubit pure states41 and GWSs based on full QST9 or full quantum process tomography24.”

    From Experimental hierarchy of two-qubit quantum correlations without state tomography (2023) · cites this paper as [24]

    Section IV reports a photonic experiment demonstrating a hierarchy of breaking channels, and states that the qubit-depolarizing channel was characterized by full process tomography. Appendix E confirms that a process matrix was calculated from 36 measurements. The paper does not describe this as an experiment with generalized Werner states or as a QST-based hierarchy of entanglement, steering, and Bell nonlocality for two-qubit states. (LLM, conf=0.85)

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Authors
Ku, H.-Y., Kadlec, J., Černoch, A., Quintino, M. T., Zhou, W., Lemr, K., Lambert, N., Miranowicz, A., Chen, S.-L., Nori, F., & Chen, Y.-N.
Affiliations
  • RIKEN (JP)
  • Palacký University Olomouc (CZ)
  • FZU - Institute of Physics of the Czech Academy of Sciences (CZ)
  • University of Vienna (AT)
  • Nagoya University (JP)
  • National Chung Hsing University (TW)
  • University of Michigan (US)
Venue
PRX Quantum
Published
2022-05-19
Volume
3
Issue
2
ISSN
2691-3399 (ISSN-L)
OpenAlex
W4280628395
Cited by
42
References
3
Citations by year
2026: 8 · 2025: 11 · 2024: 9 · 2023: 10 · 2022: 4
FWCI
2.80
Type
journal article
Language
en
Open access
Locations
  • PRX Quantum (publishedVersion, cc-by)
  • arXiv (Cornell University) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by)
  • arXiv (Cornell University)
  • Universitätsbibliothek der FU Berlin Hochschulschriftenstelle u. Dokumentenserver (cc-by)
Funders
  • Army Research Office (W911NF-19-1-0081, W911NF-18-1-0358)
  • Ministry of Science and Technology Taiwan (MOST 110-2811-M-006-539)
  • Japan Science and Technology Agency
  • Czech Science Foundation (20-17765S)
  • Palacký University (IGA_PrF_2021_004)
  • National Center for Theoretical Sciences and Ministry of Science and Technology, Taiwan (MOST 110-2123-M-006-001, MOST 109-2627-E-006-004, MOST 110-2811-M-006-546)
  • Polish National Science Centre (DEC-2019/34/A/ST2/00081)
  • Nippon Telegraph and Telephone Corporation (NTT) Research
  • Asian Office of Aerospace Research and Development (FA2386-20-1-4069)
  • Foundational Questions Institute Fund (FQXi-IAF19-06)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
Keywords
quantum channels, entanglement-breaking channels, macrorealism, temporal Bell inequalities, depolarizing channel

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Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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