Cirq v1.6.0 release

Summary

Removed the Cirq-Rigetti package. Increased the minimum Python version to 3.11. Enhanced support for experiment types and circuits for Quantum Engine. Added a new Quantum Virtual Machine "willow_pink", to simulate state-of-art Google processors.

Removal of cirq-rigetti

The Cirq-Rigetti subpackage has been removed after its deprecation in [#7058]. For legacy code needs, please use the last release cirq-rigetti-1.5.0.

General code maintenance

Increased type-check coverage by adding type annotations to unit tests (an ongoing effort). Updated annotations syntax to confirm to PEP-585. Activated ruff tool for fast code checking and linting. Deleted the outdated maintenance tool pr_monitor and eliminated the use of Docker in tools and tests.

cirq-core

Added CXSWAP and CZSWAP gates. Added transformers for manipulating operation tags and for parameterizing tagged operations. Added support for parameterized circuits in the merge-single-qubit-gates transformer. Added a new implementation of parallel XEB accepting circuits instead of single gates. Improved Randomized Benchmarking to reduce the size of generated circuits. Simplified decomposition of controlled gates with global phase. Added JSON serialization support for NoiseModel classes. Extended the QASM import parser to understand more OpenQASM 2.0 gates. Improved the output and speed of Quantum Shannon Decomposition. Implemented support for adding tags to Cirq moments. Enhanced apply_unitary and unitary to accept numpy matrices.

API change

Changed CircuitOperation to assume use_repetition_ids=False by default (you can pass the explicit argument use_repetition_ids=True to restore the previous behavior).

cirq-google

Added specifications for the new Quantum Virtual Machine (QVM) "willow_pink" with updated demos in QVM notebooks. Improved serialization of Cirq objects for Quantum Engine (QE) for better performance and to support more Cirq types. Added classes to express analog qubit frequency and coupling experiments at QE. Deprecated hard-coded default gate times in noise_properties_from_calibration.

cirq-ionq

Added support for expressing IonQ Pauli-exponential gates. Fixed a bug in the computation of inverse MSGate.

cirq-web

Improved the cirq-web package layout to avoid installing the unnecessary cirq_ts module.

A Huge Thank You

Thank you to all our contributors for this release:

ACE07-Sev, Akshita, Andreas Bengtsson, Bicheng Ying, Codrut Grosu, Danni Wang, Dax Fohl, Devon Yates, Doug Strain, Kerry Zhou, Michael Hucka, Michael Qian, Nour Yosri, Pavol Juhas, Radu Marginean, Renyi Chen, Revanth Gundala, Saurav Maheshkar, Seneca Meeks, Su Ji Park, WingCode

What's Changed

315f026b0 Change use of measurements to records in tomography [continued] (#7477) cd3213345 Fix [#7510]: remove outdated notebook about XEB (#7519) 86b38ab30 Regenerate QuantumEngineService gRPC client libraries with GAPIC (#7500) 0373f2bf3 Fix sidepanel contents for section on noise (#7518) c09b3d069 Derive _kraus_ from _apply_channel_ (#7434) 6b6a7ff03 Fix global phase computation in matrix gate decomposition (#7482) 3031b1f38 Expand product sweep parameters iteratively rather than recursively (#7523) 8e8fd80c1 Add JSON serialization support for NoiseModel classes (#7396) 11c769d78 Add clarification to GridQubit neighbors function (#7521) c434f944f Don't attempt to make the logo light/dark responsive (#7512) 118de1882 ruff - enable and fix ISC, implicit string concatenation (#7511) cb60bba80 Add num_qubits to DepolarizingChannel cirq_google serialization (#7502) bdcf70461 Remove documentation links to nonexistent documents and pages (#7506) 97718bfdb Update link to qelib1.inc file (#7508) 286fff512 Adjust example notebooks for the change of the use_repetion_ids default to false (#7504) e7636e0a4 Implementation of support for IonQ pauliexp gates (#7374) 662716b72 Make the points in cirq_google v2 proto to be double (#7498) 731f1bf67 Serialize tags on moments in cirq_google protos (#7493) c9718098c CI - activate Python 3.13 tests for all platforms (#7489) 11f6238fa Bump up grpcio-tools-1.71.2 (#7495) 325436213 NEP-29 - require minimum Python version 3.11 (#7499) fee1d374a Update Scientific Python dependencies per NEP-29 and SPEC-0 (#7496) 07fb131bc CODEOWNERS - remove owner specifications for cirq-rigetti (#7497) bb2e86bc6 Fix resolution of notebook paths when pytest is not at the repo root (#7487) 40722be31 Fix missing None types on test functions (#7494) 6d791fa8d Remove cirq-rigetti vendor module (#7488) 1e66a3945 ci - avoid overlapping artifact names from notebook tests (#7486) 89ebad8ca Cache the result of CircuitOperation.has_unitary (#7483) 460dda051 Standardize serialization of CalibrationTag (#7480) ffd78c8f7 Make isolated_notebook_test work from any directory (#7481) 2e0784b8e Add proto serialization support for circuit tags (#7478) a5dceeddb Fixing MS gate inverse is not implemented correctly (Issue 7432) (#7466) 346c95b16 Promote FrozenCircuit.tags to AbstractCircuit (#7476) e42eac275 Update RB to reduce the size of the generated circuits (#7411) 68c57413c Add noise gates to cirq_google serialization (#7443) 5adcb6429 Adding tags to Moments (#7467) b3fe87490 Add max_concurrent_jobs to Engine.get_sampler(). (#7442) b5600e6e5 Add AnalogDetuneCouplerOnly (#7444) a89f5b9f0 Fix a couple of typos in transformers (#7471) fec106cb1 Add return-type to public functions, mostly tests part 1 (#7440) f7f54e2ba Fix test flake in pauli_string_measurement_with_readout_mitigation_test (#7459) e34da074c Combine mypy version updates (#7457) 3a6875cbf Combine cirq-web updates (#7456) 45a0ead0d CI - disable cirq-rigetti tests (#7433) 7bd8953d0 Update ruff requirement from ~=0.11.11 to ~=0.12.1 in /dev_tools/requirements/deps (#7451) 73ede52a6 Address review comments for PR [#7390] (#7441) 4c7e393eb Make QVM notebooks use development version of cirq_google (#7439) 5c96d022d Add AnalogTrajectory and FreqMap (#7437) 0df354cad Update QVM demo notebooks to use "willow_pink" (#7428) 66b582ff2 Add AnalogDetuneQubit cirq google version (#7430) c9839bf1e Implements optimizations A.1 and A.2 for Quantum Shannon Decomposition (#7390) cedf22723 Simplify decomposition of controlled eigengates with global phase (#7383) cac6aad66 Ensure QVM notebooks use development version of cirq (#7436) 9a58a8b4e Support merge symbolized 1 qubit gate transformer (#7393) b1ff3aea6 Combining readout circuits for QWC pauli strings in the measure_pauli_strings method (#7416) bcd9528a6 Update dd with faster circuit construction (#7431) 7978a27d4 Fix test assertion in raw_types_test.py. (#7401) 4c9b17301 Modify apply_unitary and unitary to take in numpy unitary matrix. (#7419) 5ea1d04be Handle non-2D arrays in cirq.unitary (#7427) a83983700 Change merge_single_qubit_moments_to_phxz to support global phase. (#7405) be1b527a8 Fix typo in notebook example (#7426) 9d511e966 Extend include_tags to support by-type selection (#7425) bb7b5c1e5 CI - bump GHA windows runner to windows-2022 (#7423) dd8634f70 Deselect ruff-covered pylint rules (#7424) a025e0b1a ruff - enable and fix pylint-equivalent rules (#7420) e3959210f Cirq Exponent exception for str only (#7422) ef6a3ab11 Fixes [#7072]: Support more OpenQASM 2.0 gates from qelib1.inc (#7377) 8788b625d Update dd at "pulled-throughs meet non-cliffords" (#7409) 6bb666165 ruff - enable and fix rules F401, F601 (#7413) 4a128dc76 Cirq x exponent symbol (#7400) 15345b4f1 Enable pylint and ruff check for unused suppression comments (#7412) 4b118d064 Remove dead code for scipy<=1.5 (#7410) d1d25f837 Bump mypy to 1.16.0 (#7407) 1f17390de Prefer load_device_noise_properties in example notebooks (#7408) fa8d64d6c Fix test case names. (#7406) eebcfa050 Use list for GoogleNoiseProperties.readout_errors values (#7392) 123cbf8db QVM - deprecate default gate_times_ns in noise_properties_from_calibration (#7399) e27d883d2 Support serializing sweeps with numpy values (#7398) 92c9a9180 Ignore notebook formatting in git blame (#7389) 086b03e4c Fix more typing issues (#7388) 09b44c030 Take care of leftover conversions to PEP 585 style (#7382) 12eab3118 pylint - sync with rules used in internal codes (#7387) 8b02d60a9 Format all notebooks (no change in the code) (#7386) 35786312b Update format-incremental script to format notebooks (#7342) 852997c16 CI - add ruff check of the code (#7372) e9f869126 Move cirq-ts files to cirq-web (#7362) da44cace8 Bump networkx to minimum version 3.4 (#7378) c000faea1 Fix: Allow subtraction of IdentityGate in PauliSum.__sub__ (#7276) b0a1751ca Add list_virtual_processors function to the QVM factory (#7375) 66b3d715e Decompose controlled 1x1 unitary gates generically, not just GlobalPhaseGate (#7283) e422e166a Add new "willow_pink" processor to the QVM factory (#7366) 318887bfe Add QVM factory function load_device_noise_properties (#7369) 1c0ba5b06 Flatten controlled-CZ and controlled-CX more consistently (#7365) f5228d7ce Finalize switch to PEP 585 style type annotations (#7367) 513f30931 Update type annotations (#7364) e9a592d53 Attempt canonicalization first when decomposing controlled gates (#7269) 0f174c18a Added QASM Import Support for rzz, rxx, ryy, crx, cry, and iswap Gates (#7290) c45df8b19 Finalize switch to unquoted type annotations (part 10) (#7357) 4343ef33a Fix Linear dict scalar division test (#7361) 9c376c4e7 Update types for standard collections (#7355) d8e4a9bc9 Bump the non-security group in /cirq-web/cirq_ts with 5 updates (#7353) 1f02be718 Bump codecov/codecov-action in the actions-version-updates group (#7351) aba6fbe55 Switch to unquoted type annotations part 9 (#7356) d0a150edb Add QVM helper extract_gate_times_ns_from_device (#7350) 080ec3664 Update Type Hints (#7348) e58f3ad27 Switch to unquoted type annotations part 8 (#7345) 9e1392071 Support Reset gate in GridDevice and device specification proto (#7349) f3410e217 Remove Dockerfile and associated files and documentation (#7347) 4e12cbfac Add a symbolize transformer (#7307) 716549efd Fix another round of typing issues (#7341) b4bcdfbf9 Switch to unquoted type annotations part 7 (#7343) 01e3e9c06 NEP-29 - require minimum Python version 3.11 (#7338) 9df5d3bcc Remove documentation references to optimized_for_sycamore (#7329) 6ee6b50cc Optimize the HHL algorithm using amplitude amplification (#7141) 22b483125 Update .git-blame-ignore-revs for test return types. (#7332) 9a879c9ff Adjust type annotations for numpy-2 (#7333) 651fefae4 Add CXSWAP and CZSWAP gates (#7334) 8ad59dfc4 Fix identifying hardware changes notebook (#7328) 33b8f3c99 Add few more return-type annotations to tests (#7331) d1e68b15f Add return type for tests (#7327) b6f9c533a Disable all GitHub Actions jobs in forks (#7326) af63d6a08 Add WillowGate to cirq_google serialization (#7309) 31455422e Fix qubit metadata in identifying_hardware_changes (#7308) b136ae880 Add tag_transformers, remove_tags, index_tags. (#7306) 293f25ee0 Starts deprecating pass_operations_over for PauliString and PauliStringPhasor (#7294) 2635656a1 Switch to unquoted type annotations part 6 (#7325) 575552a58 Create a new implementation of parallel XEB and its methods (#6940) 8c5753da6 CI - fix type check with a temporary pin to numpy-1 (#7324) 2d8da7162 Rewrite inefficient sum(..., []) and sum(..., ()) (#7304) 8a322f0b9 Group updates for GitHub Actions (#7318) 63b0f178d Add the capability to accept group Paulis that can be measured using same measurement results (#7236) 69c686fce Switch to unquoted type annotations part 5 (#7317) 39306b42e CI - replace actions/cache with setup-python package caching (#7305) de37106ef Add Willow gate (#7301) 22284fe4c Update documentation about num_qubits protocol (#7299) b08bfbe9d Make cirq.Zip twenty times faster (#7303) f08565176 Improve reporting of errors & efficiency of pr-size-labeler (#7288) 4fa82fb1b Switch to unquoted type annotations part 4 (#7298) 5f7fc9afd Clarify error message for decompose_once(X(q)) (#7281) 3d0dee5c5 Switch to unquoted type annotations part 3 (#7295) 1a7688ab1 Fix minor README glitches, update Cirq logo to respond to dark/light mode, and add QAI logo (#7186) 197c83a87 Fixed visual bug and unit test (#7293) 5112418cf Fix YAML quotation error (#7286) c054b90e0 Switch to unquoted type annotations part 2 (#7278) aa3cc1184 Update cirq resolver to check sympy singletons with is instead of == (#7279) 50d71982f Remove pr_monitor (#7214) fe86bda4e Put back the issues-write permission for pr-labeler (#7277) 7f570b340 Flip test names to match expected warnings (#7275) 8824a660a Replace PR labeler with better & safer version (#7271) 28653b652 Remove first-interction.yaml workflow (#7273) e4ad080e8 Remove pytest-debug.yaml workflow (#7274) ca5921fd1 Clarify instructions for release process (#7266) 1a75d9fae Remove USE_CONSTANTS flags and make them the default (#7262) da14476b6 Roll forward [#6910] - CircuitOperation: change use_repetition_ids default to False (#7265) 92f71b6ef Test all notebooks vs stable cirq after the release (#7255) 10eb80085 Cite Cirq release 1.5.0 (#7263)