Issues

• QASM export changes multi-qubit SympyCondition equality through classical bit order

  triage/discuss
  quantumlib/Cirq#8530 · Filter by author haonanren888 opened on Nov 13, 2026

• Swapping measurement keys with with_measurement_key_mapping collapses a SympyCondition (a > b becomes a > a or b > b)

  triage/discuss
  quantumlib/Cirq#8529 · Filter by author haonanren888 opened on Nov 12, 2026

• SympyCondition can execute a control for a zero measurement when its symbol has assumptions

  triage/discuss
  quantumlib/Cirq#8528 · Filter by author haonanren888 opened on Nov 12, 2026

• KeyCondition.replace_key drops index, changing indexed classical control inside CircuitOperation

  area/circuitskind/bug-reporttriage/accepted
  quantumlib/Cirq#8525 · Filter by author haonanren888 opened on Nov 11, 2026
  1

• Potential missed optimization: drop_diagonal_before_measurement leaves an identity PhasedXZGate that blocks further removal

  area/gatesarea/optimizationkind/feature-requesttriage/accepted
  quantumlib/Cirq#8523 · Filter by author jangyoujin0917 opened on Nov 10, 2026
  1

• Potential missed optimization: CZTargetGateset misses three-qubit SWAP and CNOT network reductions

  area/gatesetsarea/optimizationkind/feature-requesttriage/discusstriage/needs-more-evidence
  quantumlib/Cirq#8522 · Filter by author jangyoujin0917 opened on Nov 10, 2026
  1

• Reproducible test flake in parallel_xeb_test.py

  area/flaky-testsarea/testingkind/bug-reportkind/healthpriority/p2triage/discuss
  quantumlib/Cirq#8477 · Filter by author pavoljuhas opened on Oct 27, 2026

• Invalid 1D state-vector lengths bypass shape validation in Pauli expectation calculations

  kind/bug-report
  quantumlib/Cirq#8463 · Filter by author NiranjanRSoorej06 opened on Oct 17, 2026
  2

• cirq_google.Engine.run() and cirq_google.EngineProcessor.run() should return a cirq_google.EngineJob

  area/google/enginekind/bug-reportpriority/before-1.8triage/accepted
  quantumlib/Cirq#8454 · Filter by author eliottrosenberg opened on Oct 14, 2026
  2

• Circuit Color Support

  area/visualizationkind/design-issuestatus/needs-agreed-designtriage/accepted
  quantumlib/Cirq#8453 · Filter by author rithikamanchala19 opened on Oct 14, 2026
  2

• Enlarge the character glyph set for nicer-looking diagrams

  area/visualizationkind/design-issuestatus/needs-agreed-designtriage/accepted
  quantumlib/Cirq#8452 · Filter by author OviyanGandhi opened on Oct 14, 2026
  1

• Pauli arithmetic drops global_shift from integer-power Pauli gates

  area/gatesarea/pauliskind/bug-reporttriage/accepted
  quantumlib/Cirq#8450 · Filter by author vera-rubin opened on Oct 14, 2026
  1

• SqrtCZGaugeTransformer changes the unitary of √CZ gates that are not literally CZ**0.5 (e.g. ControlledGate(S), OpenQASM cp(pi/2))

  area/gateskind/bug-reporttriage/accepted
  quantumlib/Cirq#8421 · Filter by author DongjaeLee-Dd2dD2 opened on Oct 9, 2026
  4

  

• cirq.unitary returns wrong matrix when control_values contains True/False

  area/decomposekind/bug-reportpriority/before-1.8
  quantumlib/Cirq#8419 · Filter by author nidheerakesh opened on Oct 8, 2026
  4

  

• Partial Circuit Rendering Feature

  area/visualizationkind/feature-requesttriage/accepted
  quantumlib/Cirq#8416 · Filter by author rithikamanchala19 opened on Oct 6, 2026
  6

  

• cirq.Simulator fails to handle measurements within looped circuit operations, but EngineSampler does

  area/google/enginearea/measurementsarea/simulationkind/bug-reportpriority/before-1.8skill/expert
  quantumlib/Cirq#8410 · Filter by author eliottrosenberg opened on Oct 5, 2026
  7

  

• [Bug]: Parameterized diagonal gates fail when printing circuit diagrams

  area/circuitsarea/visualizationkind/bug-reportpriority/before-1.8triage/accepted
  quantumlib/Cirq#8404 · Filter by author jyothikacodes opened on Oct 3, 2026
  3

  

• [Bug]: MappingManager.shortest_path raises unhandled KeyError on unreachable qubits and returns empty list for self-paths

  kind/bug-reporttriage/accepted
  quantumlib/Cirq#8380 · Filter by author SteveSonyJacob opened on Sep 25, 2026
  3

  

• Add support for numpy.random.Generator

  good first issuekind/feature-requestkind/healthtriage/accepted
  quantumlib/Cirq#8374 · Filter by author arettig opened on Sep 23, 2026
  23

  

• defer_measurements ignores BitMaskKeyCondition.index and changes circuit behavior

  good for learninghelp wantedkind/bug-reportskill/experiencedtriage/acceptedtriage/wont-fix
  quantumlib/Cirq#8361 · Filter by author WindOctober opened on Sep 20, 2026
  8

  

• Deprecate the qcircuit package from Cirq contrib

  area/qcircuitarea/visualizationkind/feature-requestskill/maintainertriage/accepted
  quantumlib/Cirq#8355 · Filter by author mhucka opened on Sep 17, 2026
  

• Optimize add_dynamical_decoupling

  area/performanceskill/experiencedtriage/accepted
  quantumlib/Cirq#8348 · Filter by author pavoljuhas opened on Sep 15, 2026
  3

• Optimize merge_single_qubit_gates_to_phxz_symbolized

  area/performanceskill/experiencedtriage/accepted
  quantumlib/Cirq#8347 · Filter by author pavoljuhas opened on Sep 15, 2026
  

• Optimize CZGaugeTransformer.as_sweep

  area/performanceskill/experiencedtriage/accepted
  quantumlib/Cirq#8346 · Filter by author pavoljuhas opened on Sep 15, 2026
  2

  

• Implement auto-labeling of issues and PRs

  area/devopshelp wantedkind/feature-requestno QC knowledge neededpriority/p3skill/experiencedtriage/accepted
  quantumlib/Cirq#8345 · Filter by author mhucka opened on Sep 15, 2026
  4