A Concise Guide to Complex Hadamard Matrices
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Complex Hadamard matrices, consisting of unimodular entries with arbitrary phases, play an important role in the theory of quantum information. We review basic properties of complex Hadamard matrices and present a catalogue of inequivalent cases known for the dimensions N = 2,…,16. In particular, we explicitly write down some families of complex Hadamard matrices for N = 12, 14 and 16, which we could not find in the existing literature.
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While a full classification of N = 6 CHMs is unknown, it is currently conjectured that the set consists of an isolated matrix S6^(0) which does not belong to any family, and a newly discovered four-parameter generic family G6^(4).
“Whilst a full classification of N = 6 CHMs is unknown, it is currently conjectured that the set consists of an isolated matrix S (0) 6 which does not belong to any family [57], and a newly discovered four-parameter generic family G (4) 6 [58].”
From Universal linear optics (2015) · cites this paper as [58]
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Conditions for optimal input states for discrimination of quantum channels
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The Kronecker product in terms of Hubbard operators and the Clebsch–Gordan decomposition of
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Small circulant complex Hadamard matrices of Butson type
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Almost Hadamard Matrices: General Theory and Examples
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Self-citationXu, D. (2017) · Quantum Information Processing · doi:10.1007/s11128-017-1534-x · Cited by 18 · see citing works
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Self-citationLocal correlations in dual-unitary kicked chainsPreprint
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Random Walk Questions for Linear Quantum Groups
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Zero-temperature entanglement membranes in quantum circuits
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Algebraic complementarity in quantum theory
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Exactly solvable quantum many-body dynamics from space-time duality
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Hadamard matrices from mutually unbiased bases
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Families of complex Hadamard matrices
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Two-parameter complex Hadamard matrices for N=6
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The quaternary complex Hadamard matrices of orders 10, 12, and 14
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Quantum Key Distribution Highly Sensitive to EavesdroppingPreprint
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Multi-directional unitarity and maximal entanglement in spatially symmetric quantum states
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Generalized graph states based on Hadamard matrices
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Image encryption using the reciprocal-orthogonal parametric transform
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Matrix product constraints by projection methods
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Unbiased complex Hadamard matrices and bases
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The defect of generalized Fourier matrices
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- Authors
- Tadej, W., & Życzkowski, K.
- Affiliations
- Cardinal Stefan Wyszynski University in Warsaw (PL)
- Jagiellonian University (PL)
- ORCID
- Życzkowski, Karol
- Venue
- Open Systems & Information Dynamics
- Publisher
- World Scientific Pub Co Pte Lt
- Published
- 2006-06
- Volume
- 13
- Issue
- 02
- Pages
- 133-177
- ISSN
- 1230-1612 (ISSN-L)
- 1793-7191
- OpenAlex
- W2039842791
- Cited by
- 263
- References
- 55
- Citations by year
- 2026: 6 · 2025: 13 · 2024: 13 · 2023: 10 · 2022: 7 · 2021: 10 · 2020: 10 · 2019: 21 · 2018: 14 · 2017: 10 · 2016: 13 · 2015: 14 · 2014: 15 · 2013: 16 · 2012: 15
- FWCI
- 17.85
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Open Systems & Information Dynamics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Institut Périmètre de physique théorique
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Coding theory and cryptography
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Computing Algorithms and Architecture
- Keywords
- complex Hadamard matrices, unimodular matrices, quantum information, finite-dimensional quantum systems, matrix families
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