Issues

• [Bug]: Invalid 1D state-vector lengths bypass shape validation in Pauli expectation calculations

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

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

  kind/bug-reporttriage/discuss
  quantumlib/Cirq#8454 · Filter by author eliottrosenberg opened on Oct 14, 2026
  1

• Circuit Color Support

  kind/design-issuetriage/discuss
  quantumlib/Cirq#8453 · Filter by author rithikamanchala19 opened on Oct 14, 2026

• Enlarge the character glyph set for nicer-looking diagrams

  kind/design-issuetriage/discuss
  quantumlib/Cirq#8452 · Filter by author OviyanGandhi opened on Oct 14, 2026

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

  kind/bug-reporttriage/discuss
  quantumlib/Cirq#8421 · Filter by author DongjaeLee-Dd2dD2 opened on Oct 9, 2026
  3

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

  kind/bug-reporttriage/discuss
  quantumlib/Cirq#8419 · Filter by author nidheerakesh opened on Oct 8, 2026
  3

• Partial Circuit Rendering Feature

  area/visualizationkind/feature-requesttriage/accepted
  quantumlib/Cirq#8416 · Filter by author rithikamanchala19 opened on Oct 6, 2026
  4

  

• cirq.Simulator does not properly handle measurements within looped circuit operations

  kind/bug-reporttriage/discusstriage/needs-reproduction
  quantumlib/Cirq#8410 · Filter by author eliottrosenberg opened on Oct 5, 2026
  3

  

• Calibration.timestamp_str() adds timestamp % 1000000 microseconds to an already exact time

  skill/experiencedtriage/needs-more-evidence
  quantumlib/Cirq#8407 · Filter by author qobserva-labs opened on Oct 4, 2026
  7

  

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

  area/circuitsarea/visualizationkind/bug-reporttriage/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
  2

• 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

  

• Explore the use of Mypyc

  area/performancearea/pythonhelp wantedkind/feature-requestno QC knowledge neededskill/experttriage/accepted
  quantumlib/Cirq#8344 · Filter by author mhucka opened on Sep 15, 2026
  2

  

• Explore the use of Numba

  area/numpyarea/performancearea/pythonhelp wantedkind/feature-requestno QC knowledge neededskill/experttriage/accepted
  quantumlib/Cirq#8343 · Filter by author mhucka opened on Sep 15, 2026
  3

• Explore possibility of using free-threaded Python

  area/performancearea/pythonhelp wantedkind/feature-requestno QC knowledge neededskill/expert
  quantumlib/Cirq#8342 · Filter by author mhucka opened on Sep 15, 2026
  4

  

• Update simulator interfaces for Cirq 2.0

  area/cirq-2.0kind/feature-requestskill/experiencedtriage/accepted
  quantumlib/Cirq#8341 · Filter by author mhucka opened on Sep 15, 2026
  2

• Implement qubit containers for Cirq 2.0

  area/cirq-2.0kind/feature-requestskill/experiencedtriage/accepted
  quantumlib/Cirq#8340 · Filter by author mhucka opened on Sep 15, 2026
  2

  

• Implement multiway branch operators for Cirq 2.0

  area/cirq-2.0kind/feature-requestskill/experiencedtriage/accepted
  quantumlib/Cirq#8339 · Filter by author mhucka opened on Sep 15, 2026
  2

  

• Implement control flow operator Cirq.For operator for Cirq 2.0

  area/cirq-2.0kind/feature-requestskill/experiencedtriage/accepted
  quantumlib/Cirq#8338 · Filter by author mhucka opened on Sep 15, 2026
  3