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Complex Hadamard spherical code[1]

Description

A spherical code obtained from particular complex Hadamard matrices [2].

Protection

Covering radius can be bounded in terms of the code’s spherical design strength [1].

Notes

Database of complex Hadamard matrices [3].

Cousin

Member of code lists

References

[1]
M. Shi, D. Lu, A. Armario, R. Egan, F. Ozbudak, and P. Solé, “Butson Hadamard matrices, bent sequences, and spherical codes”, (2023) arXiv:2311.00354
[2]
R. Egan, “A survey of complex generalized weighing matrices and a construction of quantum error-correcting codes”, (2023) arXiv:2309.07522
[3]
W. Tadej and K. Zyczkowski, “A concise guide to complex Hadamard matrices”, (2006) arXiv:quant-ph/0512154
[4]
B. Sarac and D. Acar, “A Construction of Quantum Stabilizer Codes from Classical Codes and Butson Hadamard Matrices”, (2024) arXiv:2407.13527
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Zoo Code ID: complex_hadamard

Cite as:
“Complex Hadamard spherical code”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2026. https://errorcorrectionzoo.org/c/complex_hadamard, arXiv:2606.11484
BibTeX:
@incollection{eczoo_complex_hadamard,
title={Complex Hadamard spherical code},
booktitle={The Error Correction Zoo},
year={2026},
editor={Albert, Victor V. and Faist, Philippe},
eprint={2606.11484},
doi={10.48550/arXiv.2606.11484},
url={https://errorcorrectionzoo.org/c/complex_hadamard}
}
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Permanent link:
https://errorcorrectionzoo.org/c/complex_hadamard

Cite as:

“Complex Hadamard spherical code”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2026. https://errorcorrectionzoo.org/c/complex_hadamard, arXiv:2606.11484

Github: https://github.com/errorcorrectionzoo/eczoo_data/edit/main/codes/classical/spherical/q-ary/complex_hadamard.yml.