Cited by 1,482Quantum Mechanics and ApplicationsQuantum Information and CryptographyQuantum many-body systems

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Extreme quantum entanglement in a superposition of macroscopically distinct states

Mermin, N. David·1990·Physical Review Letters

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Abstract

A Bell inequality is derived for a state of n spin-1/2 particles which superposes two macroscopically distinct states. Quantum mechanics violates this inequality by an amount that grows exponentially with n.

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Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?
Einstein, A., Podolsky, B., & Rosen, N. (1935) · Physical Review · doi:10.1103/physrev.47.777 · Cited by 16,654
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Bell, 1965, Physics (N.Y.), 1, 195
Bohm, 1951, Quantum Theory

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“Therefore, although GHZ states are of perfect symmetry among parties, which act as important resources for anonymous tasks [12], their practical applications are restricted in large-scale quantum communication with current technologies.”
Background
Closing the detection loophole in tripartite Bell tests using the W state
Pál, K. F., & Vértesi, T. (2015) · Physical Review A · doi:10.1103/physreva.92.022103 · Cited by 15
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“Mermin gave logical nonlocality proofs for n-partite generalisations of the GHZ state [42] for all n > 2.”
Background
Genuine multipartite nonlocality in the one-dimensional ferromagnetic spin-1/2 chain
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Authors: Mermin, N. D.
Affiliations: Cornell University (US)
Corresponding author: Mermin, N. David
Venue: Physical Review Letters
Publisher: American Physical Society (APS)
Published: 1990-10
Volume: 65
Issue: 15
Pages: 1838-1840
ISSN: 0031-9007 (ISSN-L)
DOI: 10.1103/physrevlett.65.1838
OpenAlex: W2094119863
Cited by: 1,482
References: 3
Citations by year: 2026: 44 · 2025: 66 · 2024: 66 · 2023: 80 · 2022: 65 · 2021: 59 · 2020: 45 · 2019: 107 · 2018: 56 · 2017: 47 · 2016: 66 · 2015: 55 · 2014: 46 · 2013: 66 · 2012: 62
FWCI: 5.96
Type: journal article
Language: en
Open access: closed
Locations: Physical Review Letters (publishedVersion)
PubMed (publishedVersion)
Topics: Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Information and Cryptography
Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum many-body systems
Keywords: Bell inequalities, quantum entanglement, macroscopic superposition, spin-1/2 particles, quantum violation

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Extreme quantum entanglement in a superposition of macroscopically distinct states

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