Changelog
Deprecated
- Deprecate the QiskitIndexError exception class (6642)
- Deprecate legacy provider interface (6337)
- use ParameterExpression.gradient directly (6335)
- Add property and setter for DAGNode.name (6199)
- Change attribute `most_likely_phase` to `phase` in PhaseEstimator (6238)
- Replace DAGNode.condition with DAGNode.op.condition (6110)
Added
- Pulse optimal decomposition of su4 for CNOT (6581)
- Add the option to wrap circuits in ``QuantumCircuit.compose`` (6659)
- Add dynamical decoupling transpiler pass (6619)
- Add align measure pass (6673)
- Add settings property to optimizer classes in ``qiskit.algorithms.optimizers`` (6545)
- BIP mapping pass (6580)
- Add PauliList class (5993)
- Add support for faulty directed gate (6407)
- Move gate, control, and param label selections from 3 circuit drawers to utils (6078)
- Add option to sort by values to plot_histogram (6592)
- latex-source (and latex) circuit drawer support for standalone (and cleaner output) (6483)
- QuantumCircuit.ccx(..., ctrl_state=...) parameter added for consistency with other controlled gates (6508)
- Add line_discipline kwarg to job_monitor function (5691)
- Allow users to optionally specify Isometry tolerance (6482)
- Add option to set encoding when saving Qasm to file (5842)
- Add a new transpiler pass to remove all barriers (6329)
- Add plain Gradient Descent optimizer (6459)
- Arithmetic circuit library: multipliers (6470)
- Create function to set user config (5943)
- Add StabilizerState class to qiskit.quantum_info.states (5907)
- Classical conditioning on individual classical bits now supported (6018)
- Added the class RZXCalibrationBuilderNoEcho (6300)
- Arithmetic circuit library: Adders (6164)
- 2-SPSA and QN-SPSA (6405)
- Add distributions results objects (6377)
- Add SciPyOptimizer (6319)
- Add qpy serialization format (5578)
- Issue 6326 (6327)
- Adding IBMQ_guadalupe as a mock backend (6265)
- Latex drawings now show numbering of active wires in custom instructions (6153)
- Adding Pauli and city to the draw option for statevector (6146)
Changed
- Wrap library circuits (6634)
- Classical condition boxes are now drawn as bullets in text drawer (6370)
- Move `Gate.label` to parent `Instruction` class (6626)
- Make tweedledum a hard requirement (6588)
- Don't enable multiprocessing by default on Python 3.9 (6524)
- Enable lo frequencies to be passed in circuits (6167)
- Using MissingOptionalLibraryError for consistency (6098)
- save a PDF file if circuit.draw(..., filename=<something>.pdf) (6446)
- Use symengine for parameter and parameter expressions (6270)
- Update fake backend and fake provider to use versioned interface (6286)
- Support ``reps=0`` in the n-local circuits (6273)
- Remove deprecation for pulse instruction parameter method (6277)
- Update circuit.delay to accept parameterized duration (Fix 6029) (6225)
- ScheduleBlock 4/4 - add ScheduleBlock (6158)
- Decompose controlled Pauli rotations in terms of Paulis (4837)
Fixed
- Fix qasm output for composite gates (5887)
- Fix `Optimize1qGatesDecomposition` length heuristic (6553)
- Add Expectation Converter to Gradient Wrapper (6274)
- fix bug in layout deletion (6683)
- Fixed qc.num_connected_components() for circuits with bit conditioned gates (6564)
- Fixed issue 6623 by raising errors for negative delay durations (6625)
- Fix calibration handling of transpiler passes on gates with >2 qubits (6655)
- fix 6547 (6562)
- Delay support when loading from QASM2 (6594)
- Improve error handling in creating Pauli with an invalid label (5911)
- Fix quantum part of Shor's algorithm (6310)
- Fix oracle_evaluation for PhaseOracle (6365)
- Fix 6497 (opflow.expectations ignore coefficients) (6500)
- TwoLocal entangling map works for numpy integers (6556)
- qc.num_connected_components() now returns the correct output (6519)
- Fix PiecewiseChebyshev does not work as expected when breakpoints = None (6210)
- TwoLocal raises proper exception for reps input that is not int and added unit tests (6522)
- Fix adding controls to an open controlled gate (6309)
- Fixed NFT optimizer by including argument for args as supplied (6527)
- Fix result aggregation when parameterized qobj is enabled with measurement mitigation (5494)
- Fixed typo in LinearAmplitudeFunction docstring (6491)
- Fix 2 problems with reverse_bits on all 3 circuit drawers (5938)
- improve error message for LookaheadSwap pass (6452)
- Matplotlib drawer fix for drawing custom instructions with classical register (6339)
- Fix addition of PauliSumOp with parameters (6316)
- Correctly require is_good_state on AmplificationProblem constructor (6417)
- Respect max_experiments in QuantumInstance BackendV1 path (6391)
- VQE with L_BFGS_B and P_BFGS supports Gradient (6373)
- The text drawings of custom instructions with clbits are now drawn as expected (6242)
- Drawing boxes of custom instructions extended to classical bits in latex (6240)
- Fix 6159 (Remove Unexpected Warning of PauliExpectation and AerPauliExpectation) (6281)
- Typo fix of controlled SWAP gate documentation (6358)
- fix optimal num iterations (6298)
- BasisTranslator skips translating gates already in target basis (6350)
- Support multiplication of TaperedPauliSumOp with ParameterExpression (6315)
- Fix behavior of instmap.add when partial function is specified (6292)
- Fix schedule inline transform (6322)
- plot_histogram does not raise for neg values (6340)
- Add support on QuantumInstance/run_circuits for Backends that don't handle QasmQobj (6299)
- Fix 6307 (PauliExpectation takes unnecessary adjoint when it converts operators) (6318)
- fix empty check of block subroutine (6325)
- Fix QuantumState._subsystem_probabilities (6324)
- Fix expval pauli qargs bug (6304)
- Fixes disassembler error for mcx gate (6291)
- fix error when `dag_drawer` removes a temporary file that is still open (6266)
- Fix bug in ``Pauli.evolve`` for CZ, CY, Swap (6287)
- object generation fix (6282)
- Bug fixes for callback function in SPSA (6253)
- fix global phase in initializer (6236)
- Small fixes in the ``SparseVectorStateFn`` (6272)
- BooleanExpression expression breaks label in the latex circuit drawer (6260)
- Bugfix in clifford instruction name (6251)
- Unroller error more descriptive when reaching a node without definition (6235)
- Don't remove swaps with conditions in OptimizeSwapBeforeMeasure (6239)
- mpl circuit drawer does not change the style dict in-place (6190)
- Pulse Builder: fix seconds_to_samples() for numpy arrays (6213)
- Better tolerances for gate decompositions (5827)
- global phase reverse_bits (6206)
- Fix error on construct_circuit 'a' parameter handling (6216)
- Allow custom gate color in the MPL circuit drawer (6184)
- Fix params for a controlled - UnitaryGate (5780)
- better unrolling in preset passmanagers (6133)
- Fix SPSA recalibration (6173)
- Preserve global phase in `Unroller` (6155)
- Ensure we include all cython files in sdist (6163)
- MCZ is now drawn correctly in matplotlib (5981) (6008)