Issues

• Add an in-place adder with carry-out

  quantumlib/Qualtran#1965 · Filter by author aadityarshah opened on Oct 3, 2026
  1

• GF2MulK().controlled().decompose_bloq().flatten() is not identity when ctrl=0

  quantumlib/Qualtran#1951 · Filter by author so-dev000 opened on Sep 24, 2026
  3

• make_beverland_et_al() uses Beverland's a=0.03 for FifteenToOne's error model instead of Litinski's own a=0.1 (arXiv:1808.02892)

  quantumlib/Qualtran#1944 · Filter by author kkoci opened on Aug 31, 2026
  5

• degree_jacobi_anger_approximation silently returns degree ~1 for a large fraction of inputs (and can raise AssertionError) — up to ~1000× cost underestimates in HamiltonianSimulationByGQSP

  quantumlib/Qualtran#1937 · Filter by author sausterm opened on Aug 16, 2026

• Lazy evaluator for Bloq execution

  quantumlib/Qualtran#1895 · Filter by author vtomole opened on Jul 12, 2026
  3

• Cannot use tensor_contract and TextbookQPE together

  quantumlib/Qualtran#1861 · Filter by author BrendanKKrueger opened on May 20, 2026
  4

• [Performance] Resource counting for a bloq.adjoint() needs a bloq decomposition even when my_static_cost or build_call_graph is implemented for the bloq

  quantumlib/Qualtran#1841 · Filter by author Axel-pappalardo opened on Apr 14, 2026
  2

• [Feature Request] Support for DFTHC (Double Factorized Tensor HyperContraction) Block Encoding [arXiv:2502.15882]

  quantumlib/Qualtran#1829 · Filter by author TaeKim-99 opened on Mar 12, 2026
  1

• Addition call_graph inconsistent with decomposition for registers with unequal bitsizes

  kind/bug-report
  quantumlib/Qualtran#1818 · Filter by author kjm538 opened on Feb 24, 2026
  2

• Can't run tests on Python 3.14

  area/devops
  quantumlib/Qualtran#1814 · Filter by author mpharrigan opened on Feb 17, 2026
  1

• Devops 2026

  area/devops
  quantumlib/Qualtran#1807 · Filter by author mpharrigan opened on Feb 10, 2026

• Impractical to use Partition with CDType (always needs a QAny)

  area/qdatatypebloqs/bookkeeping
  quantumlib/Qualtran#1799 · Filter by author Axel-pappalardo opened on Jan 23, 2026
  2

• NDArray[MyObject] type annotations are not allowed

  area/devops
  quantumlib/Qualtran#1789 · Filter by author mpharrigan opened on Jan 7, 2026

• LCUBlockEncoding and LinearCombination have misleading names

  quantumlib/Qualtran#1773 · Filter by author petim0 opened on Nov 28, 2025
  1

• BlockEncoding interface seems too permissive: register names or ordering should be defined

  quantumlib/Qualtran#1772 · Filter by author petim0 opened on Nov 28, 2025
  4

• 1-wiring-up.ipynb file has issues

  quantumlib/Qualtran#1766 · Filter by author Razeen-ud-din opened on Nov 18, 2025
  1

• Reliance on cirq.ControlledGate is brittle

  area/cirq
  quantumlib/Qualtran#1764 · Filter by author mpharrigan opened on Nov 12, 2025

• Cirq simulation regressions

  area/cirq
  quantumlib/Qualtran#1763 · Filter by author mpharrigan opened on Nov 11, 2025

• Implement the mixed magintude approximation protocol

  area/rotation_synthesishelp wanted
  quantumlib/Qualtran#1759 · Filter by author NoureldinYosri opened on Nov 10, 2025

• Increase the test coverage in rotation_synthesis

  area/rotation_synthesishelp wanted
  quantumlib/Qualtran#1758 · Filter by author NoureldinYosri opened on Nov 10, 2025

• Performance Improvements to rotation synthesis

  area/rotation_synthesishelp wanted
  quantumlib/Qualtran#1757 · Filter by author NoureldinYosri opened on Nov 10, 2025

• Add a way to represent a Probabilistic Channel as a Cirq circuit

  area/rotation_synthesishelp wanted
  quantumlib/Qualtran#1756 · Filter by author NoureldinYosri opened on Nov 10, 2025
  1

• Add a general way to compute the diamond norm distance

  area/rotation_synthesishelp wanted
  quantumlib/Qualtran#1755 · Filter by author NoureldinYosri opened on Nov 10, 2025
  5

  

• T_complexity of adjoint QROAMClean gives negative T count

  quantumlib/Qualtran#1752 · Filter by author austingmhuang opened on Nov 4, 2025
  2

• Notebook tests are slow

  area/devops
  quantumlib/Qualtran#1745 · Filter by author mpharrigan opened on Oct 21, 2025
  4