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In this article, we analyze the sum of two independent quantum computing errors in an\n                    <jats:inline-formula>\n                      <jats:alternatives>\n                        <jats:tex-math>$$n-$$<\/jats:tex-math>\n                        <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                          <mml:mrow>\n                            <mml:mi>n<\/mml:mi>\n                            <mml:mo>-<\/mml:mo>\n                          <\/mml:mrow>\n                        <\/mml:math>\n                      <\/jats:alternatives>\n                    <\/jats:inline-formula>\n                    qubit and obtain a formula for the fidelity of the sum of these errors. We prove this result for isotropic quantum computing errors and conjecture that it also holds true for general quantum computing errors.\n                  <\/jats:p>","DOI":"10.1007\/s11128-025-05037-5","type":"journal-article","created":{"date-parts":[[2026,1,27]],"date-time":"2026-01-27T08:22:46Z","timestamp":1769502166000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Fidelity of the sum of independent quantum computing errors"],"prefix":"10.1007","volume":"25","author":[{"given":"Jes\u00fas","family":"Lacalle","sequence":"first","affiliation":[]},{"given":"Luis Miguel","family":"Pozo Coronado","sequence":"additional","affiliation":[]},{"given":"Rafael","family":"Mart\u00edn-Cuevas","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2026,1,27]]},"reference":[{"key":"5037_CR1","doi-asserted-by":"publisher","first-page":"1098","DOI":"10.1103\/PhysRevA.54.1098","volume":"54","author":"AR Calderbank","year":"1996","unstructured":"Calderbank, A.R., Shor, P.W.: Good quantum error-correcting codes exist. 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