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Author (up) Gomez-Lurbe, R. url  doi
openurl 
  Title Efficient protocol to estimate the Quantum Fisher Information Matrix for commuting-block circuits Type Journal Article
  Year 2026 Publication Quantum Information Processing Abbreviated Journal Quantum Inf. Process.  
  Volume 25 Issue 9 Pages 278 - 16pp  
  Keywords Quantum Fisher Information Matrix; Variational quantum algorithms; Parameterized quantum circuits; Geometry-aware optimization; Commuting-block circuits  
  Abstract The Quantum Fisher Information Matrix (QFIM) quantifies how sensitive parameterized quantum states are to changes in their parameters. Recently, it has been used to improve variational quantum algorithm optimization through geometry-aware techniques. However, estimating the QFIM-particularly its off-block-diagonal elements-requires substantial resources. To address this, we introduce a novel protocol that efficiently computes these elements for commuting-block variational circuits. Our approach reduces the number of quantum state preparations from O(m2) to O(L2) , where m is the number of parameters and L the number of circuit layers. This also lowers classical measurement and post-processing requirements, improving computational efficiency.  
  Address [Gomez-Lurbe, Rafael] Univ Valencia, Dept Fis Teor, CSIC, Burjassot 46100, Valencia, Spain; [Gomez-Lurbe, Rafael] Univ Valencia, IFIC, CSIC, Burjassot 46100, Valencia, Spain, Email: rafael.gomez-lurbe@uv.es  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1570-0755 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001842963200005 Approved no  
  Is ISI yes International Collaboration no  
  Call Number IFIC @ pastor @ Serial 7373  
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