A verifiable quantum advantage towards real world applications: Quantum Echoes 
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      openfermion.transforms.prune_unused_indices
  
      
    
  
  
  
  
  
    
  
  
    
    
Remove indices that do not appear in any terms.
openfermion.transforms.prune_unused_indices(
    symbolic_operator
)
Indices will be renumbered such that if an index i does not appear in
any terms, then the next largest index that appears in at least one
term will be renumbered to i.
  
  
 
  
    
    
      
    
    
  
       
    
    
  
  
  Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
  Last updated 2025-06-06 UTC.
  
  
  
    
      [[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-06-06 UTC."],[],[]]