Qiskit Terra 0.12.0

Changelog

Deprecated

• Rename and deprecate qubit keyword args on standard gates. (#3788)
• Add entropy and entanglement state measures to quantum_info (#3758)
• Deprecate the PersistentValue instruction. The ConstantPulse parametric pulse should be used in its place. This requires the user to know the duration for which the signal amplitude should be changed. (#3756)
• Add dot method to operator classes (#3740)
• add partial_trace function to quantum_info (#3665)
• Deprecate circuit_instruction_map (#3717)
• output as first kwarg in circuit.draw (#3632)
• Add python 3.8 support and deprecate python 3.5 (#3268)

Added

• add repr to qiskit.visualization.text.TextDrawing (#3722)
• Utility function to measure qubits using OpenPulse (#3730)
• add partial_trace function to quantum_info (#3665)
• Add average_gate_fidelity, gate_error, and modify process_fidelity functions (#3660)
• Parametric Pulses (#3620)
• Crosstalk adaptive gate scheduling pass (#3532)
• Add CouplingMap.draw method. (#3630)
• Coupling map constructors (#3618)
• add zxz decomposition (#3519)
• Add python 3.8 support and deprecate python 3.5 (#3268)

Changed

• make controlled base gate an instance. (#3773)
• Allow for circuit measure methods to return a new circuit with inplace kwarg (#3755)
• override control of standard gates where possible (#3631)
• Add entropy and entanglement state measures to quantum_info (#3758)
• Change rep_time unit to s (#3612)
• add repr method for ParameterTable (#3754)
• Enable numpy array local simulator return types (#3181)
• #2262 | Acquire commands on a single qubit (#3574)
• Add dot method to operator classes (#3740)
• Run dense layout if trivial layout is not perfect at level 1 (#3657)
• Make assemble() respect max_shots (#3606)
• Assemble meas levels validation (#3694)
• output as first kwarg in circuit.draw (#3632)
• Add Crx and Cry gates (#3600)
• Setting limits for CSPLayout (#3515)

Fixed

• Fix bind propagation when decomposing composite gates. (#3729)
• Add support for displaying controlled gates to latex (#3777)
• Add support for controlled gates to mpl drawer (#3779)
• Fix latex drawing conditions for 2 and 3 qubit gates (#3778)
• Collect2qBlocks to always exclude conditioned gates from blocks. (#3782)
• When label is provided, text-draw it instead of the name (#3760)
• Increase job watcher cancel button width. (#3708)
• Fixed issue 3673 (#3675)
• Fix bug where lo units were not being properly converted (#3597)
• Visualizers properly represent complex numbers (#3666)
• Fix Operator.transpose for non-square operators (#3672)
• Fixes issue 3607 (#3642)
• Added one time warnings for dt and qubit_freq_est turning into properties (#3594)

Qiskit Terra 0.11.1

Changelog

Fixed

• Fixes issue 3607 (#3642) (#3681)
• Fix bug where lo units were not being properly converted (#3597) (#3696)
• Add one time warnings for dt and qubit_freq_est turning into properties (#3594) (#3680)
• update mel (#3677) (#3679)

Qiskit Terra 0.11.0

Changelog

Deprecated

• Deprecate cmd def (#3573)
• TranspilerAccessError is deprecated in favor of TranspilerError (#3222)
• Deprecate qx_color_scheme() (#3220)
• Mostly remove sympy and deprecate sympy Instruction parameters (#3156)
• Remove buffer options in Pulse (#3297)

Added

• Format pulse defaults (#3526)
• Add argument to ignore framechange only channels for schedules drawing (#3441)
• Use Enum for meas_level and meas_return (#3493)
• Add ability to get counts from statevectors and density matrices (#3514)
• Add Hellinger fidelity discrete probability measure. (#3510)
• Result marginal counts (#3446)
• CSP layout selector (#3043)
• add ControlledGate class (#2862)
• Add from_label to Operator class (#3342)
• Add layout score analysis pass (#3321)
• Add Instruction.is_parameterized() (#3328)
• Add support for slicing and concatenation of PassManagers (#3209)
• Add R gate to standard gates (#3341)
• Parallel support for PassManager.run() (#3290)
• Add dual of mpl mathtext syntax for latex drawer labels (#3224)
• Add alias for cnot function to cx() (#3255)
• Auto Scale PulseScheduler drawing (#3180)
• Basic pulse scheduler (#2650)

Changed

• The exceptions QiskitError qiskit/circuit/* are being replaced by CircuitError (a QiskitError subclass) (#3210)
• Move barrier_before_final_measurements to 'passes' directory (#3260)

Removed

• remove CXBase (#3543)
• Remove implicit string cast of the snapshot label (#3544)
• Remove deprecated UBase gate (#3539)
• Round of deprecation removal (#3190)
• Removing U0Gate (#3431)

Fixed

• Add validation of backend memory support when executing with memory=True (#3528)
• Fix side effects of setting numpy.random.seed (#3541)
• fix no reg depth (#3513)
• Gate parameters support mix of indexes and bits (#3490)
• Deal with None as return from job.queue_position() (#3458)
• Fix Schedule Plot reflecting duration of final schedule even if it is not plotted (#3418)
• Fixes bug in concurrence using eigh instead of eigvals for possibly non-hermitian matrices (#3376)
• Stop setting explicit background color in plot_histogram() (#3277)
• Fix matplotlib with wide parameters (#3354)
• Fix bug in align_acquires where measurement pulses had to be added before AcquireInstructions (#3307)
• Collect2qBlocks, CommutationAnalysis to ignore parameterized gates. (#3288)
• In plot_state_city, make the z=0 plane extend to the axes limits on all sides. (#3211)
• CouplingMap.distance was returning non-int (#3323)
• Added in custom unitary to qasm (#3069)
• Removed the usage of stochastic swap trivial_flag as it can lead to single-qubit gates being omitted (#3285)
• Better handling when empty instructions are unrolled or inverse (#3274)

Qiskit Terra 0.10.0

Changelog

Deprecated

• Deprecate passing in an ast node as a instruction parameter (#3240)
• add instruction.control deprecation release notes (#3188)
• Deprecate allowing extra keys in circuit drawer style dict (#3105)
• Deprecate Bit-tuple equality check (#3040)

Added

• Add support for partial results to Result class (#3217)
• Add initial support for working with ion-trap devices (#3214)
• Add ax kwarg to matplotlib visualization functions (#3053)
• Add QV info to backend monitor and overview (#3141)
• Add new passmanager.replace(index, ...) method (#3004)
• Add measure_all, measure_active, remove_final_measures methods (#2993)
• Add float exponentiation for Gates (#2811)
• Add negation support for Parameter class. (#3148)
• add rxx gate (#3113)
• One qubit Euler basis decomposer (#3115)
• add snapshot of real calibration data to mock backends (#3060)

Changed

• average_data can be imported from qiskit.quantum_info.analysis (#3159)
• "fold" option unified across circuit drawers (#3108)
• Add DAGCircuit.substitute_node for single node replacement. (#3145)
• Validate input when setting the QuantumCircuit data attribute directly (#2838)
• Only close mpl figures in jupyter with inline backends (#3051)

Removed

• Remove deprecated device specs (2 months ago) (#3033)
• Remove deprecated schedule ops (#3034)

Fixed

• Modified rzz visualization in latex circuit drawer to match cu1 (#3155)
• Fix circuit drawing justification (#3061)
• Fix for #3106 gatefacecolor key on circuit diagrams (#3137)
• Fix a syntax error in QuantumCircuit.mirror. (#3138)
• Fix mpl conditional drawing (#3032)

Qiskit Terra 0.9.1

Changelog

Fixed

• Fix for #3106 gatefacecolor key on circuit diagrams (#3137) (#3142)
• Fixed classical registers drawing offset (#3081)
• Fix mpl conditional drawing (#3032) (#3049)

Qiskit Terra 0.9.0

Changelog

Deprecated

• The gates U and CX are being deprecated in favor of u3 and
  cx. (#2380)
• The gate u0 is being deprecated in favor of using multiple id gates
  to insert delays (#2664)
• The decorator requires_qe_access is being deprecated in favor of
  online_test.
• The as_dict method of Qobj is deprecated in favor of to_dict. (#2556)

Added

• A new pulse instruction, Delay. A Delay occupies a pulse channel for a
  duration of time, blocking other instructions from being inserted in this time. (#2869)
• Ability to check for equality of pulse Schedule and Instruction. (#2873)
• Added tests for gate_map and reference images for testing plot_gate_map
• New CountOpsLongest analysis pass to retrieve the number of operations
  on the longest path of the DAGCircuit. (#2734)
• Added sech and sech_deriv pulses in qiskit.pulse.pulse_lib.
• The option vertical_compression was added to the text drawer and
  to the QuantumCircuit.draw method. The option allows to control
  how much room the text circuit drawing takes.
• The option idle_wires was added to the drawers to control
  if wires without any operation should be included in the drawing. (#2692)
• Introduced a visualization for the Pass Manager. (#2445)
• New pulse schedule method Schedule.filter to filter by instruction
  channel, time, and type. (#2597)
• Decomposition of arbitrary isometries (#2600)
• Decomposition of diagonal gates (#2600)
• Decomposition of multiplexed rotation gates (#2600)
• Decomposition of multiplexed single-qubit unitaries (Option: decompose
  up to a diagonal gate) (#2600)
• ZYZ decomposition for single-qubit unitaries (#2600)
• Gray-Synth and Patel–Markov–Hayes algorithms for synthesis of
  CNOT-Phase and CNOT-only (linear) circuits (#2457)
• Added n-qubit unitaries to BasicAer simulator basis gates (#2342)
• Added a random_circuit function under qiskit.circuit.random
  (#2553)
• Added equiv method to Operator and Statevector classes for
  testing if two objects are equivalent up to global phase (#2910)
• Added output_name as a transpiler parameter to set the name of
  output circuits (#2745)
• Simple expressions of Parameters can now be created via the four basic math
  operations (+,-,*,/). (#2537)
• A ParmeterVector class has been added to ease the construction of circuits
  requiring a large number of parameters. (#2379)
• dag.draw() method to visualize DAGCircuit objects (#3016)

Changed

• Intervals are now defined by start and stop, rather than begin and end.
• TimeslotCollections now are sorted by default and have more efficient merges.
• Pulse samples are now clipped if their norm is between 1 and 1+epsilon.
  Otherwise an error is raised.
• Schedule.instructions now returns with time-ordering.
• More informative errors are now raised if qubit_lo_freq and
  meas_lo_freq are not supplied to assemble_schedules. (#2833)
• pulse.samplers module has now been moved to pulse.pulse_lib.samplers. (#2881)
• The number of memory slots required will now be inferred from the supplied
  schedules if memory_slots is not supplied.
• All circuit drawers now express most commonly used fractions
  of PI (#2808).
• Set default repetition time to be the first available.
• Pulse commands may now start with capitalized letters.
• The pylatexenc and pillow requirements are now optional. These
  are only used by the latex and latex_source circuit
  visualization backends. To continue using them ensure these are
  installed. (#2451)
• When adding a register to a circuit, an error will now be raised if
  a register of the same name is already present. Previously, an error
  would only be raised if the same register was added twice.
• Qubits and classical bits are not represented as a tuples anymore,
  but as instances of Qubit and Clbit respectively. (#2414)
• The ApplyLayout pass is incorporated in all preset pass managers to
  delineate a virtual circuit from a physical circuit (#2672)
• Mapping passes (CXDirection, Swap passes, CheckMap, CheckCnotDirection)
  now operate on a register-less circuit corresponding to
  an already embedded physical circuit. (#2672)
• Replaces LegacySwap by faster, more stable StochasticSwap pass (#2672)
• Uses level 1 by default as transpiler optimization level (#2672)
• Change Snapshot signature to match simulator.snapshot (#2592)
• DAGCircuit.width() formerly returned number of qubits, now returns total
  number of qubits + classical bits (#2564)
• Functions assuming the former semantics of DAGCircuit.width() now call
  DAGCircuit.num_qubits() (#2564)
• DAGCircuit.num_cbits() renamed to DAGCircuit.num_clbits() (#2564)
• Changed definition of Cu3Gate to to equivalent to the canonical
  definition of a controlled U3Gate (#2755)
• coupling_map now required to validate a backend.configuration() (#2836)
• The method QuantumCircuit.count_ops now returns an OrderedDict instead of a dict.
• If layout information is available in
  the circuit, it will be included to the circuit drawing. This can be removed
  using the option with_layout=False in the method
  QuantumCircuit.draw. (#2739)
• Q-sphere visualization is enhanced and corrected (#2932)
• Shorter CH gate definition involving only 1 CX (#2837)
• Now PassManager.draw() (without any argument) will return an in-memory PIL image.

Removed

• The ability to set the Timeslots for a pulse Instruction at initialization.
• The previously deprecated functions
  qiskit.visualization.plot_state and
  qiskit.visualization.iplot_state have been removed. Instead use
  the specific functions for each plot type (#2325).
• International documentation of outdated readme etc (#2302)
• Removed deprecated options in execute, transpile, and assemble.
  Removed deprecated compiler.
• Removed deprecated qcvv in tools. Removed deprecated converters
  qobj_to_circuits and circuits_to_qobj (#2301)
• The previously deprecated qiskit._util module has been removed.
  Use qiskit.util instead. (#2329)
• The logging tools in qiskit.tools.logging are removed. (#2387)
• The qiskit.qiskiterror module has been removed. Please use
  qiskit.exceptions instead. (#2399)
• Removed previously deprecated DAGCircuit methods (#2542)
• Removed CompositeGate class, in favor of adding Instruction
  objects directly (#2543)
• Removed ignore_requires and ignore_preserves options from
  PassManager (#2565).

Fixed

• Fixes a bug where the CmdDef was getting built without buffers on channels.
• Fixed bug in Pulse for multiple parameters being added (#2742)
• Fixed bug in Pulse for CmdDef arguments (#2741)
• Fixed bug in Operator and SuperOp for initializing from circuit
  containing gates without an explicit matrix definition (#2723)
• Possible to decompose SU(4) gate into non-CNOT basis with
  TwoQubitDecomposer
• Fixes a bug that removed id gates from circuit. id gates are
  like a wait command and will never be removed (#2663)
• Fixed bug in CommutationAnalysis pass affecting conditional gates (#2669)
• Fixed bug in measure sampling for BasicAer Qasm simulator if a qubit
  was measured into more than one classical bit (#2735)
• Correctly serialize complex numbers with a nonzero real part
• Fixed bug in measure sampling for BasicAer Qasm simulator if only a
  subset of qubits are measured (#2790)
• Parameter objects can be serialized and communicated between
  sub-processes (#2429)
• Parameterized circuits no longer need to be transpiled individually (#2864)

Qiskit Terra 0.8.2

Changelog

Fixed

• Fixed an issue with latex circuit drawer backend that could lead to an
  empty image output (#2531)
• Fixes for issues with the backend monitors for recent changes to IBMQ
  backends (#2637)
• Fixed an issue where a TimeSlotCollection object would be mutated
  by the is_mergable_with() method (#2639)

Qiskit Terra 0.8.1

Changelog

Fixed

• Corrected the deprecation warning message for
  qiskit.converters.qobj_to_circuits (#2350)
• Fixed execute() and transpile() functions to enable setting
  optimization level 0. (#2370)
• Set the swapper with the seed transpiler for optimization level 2 and 3
  (#2361)
• Fix default basis gate set for other transpiler passes (#2357)
• Fix the docstring for transpile to include optimization_level 3 (#2367)
• Fix spacing in the text circuit drawer (#2382)
• Fix for too strict math sanitization pulse instructions (#2397)
• Arugments to assemble_schedule were not actually optional, ensure
  they're required (#2398)
• Fix for framchange instructions being converted to a string instead of a
  float (#2437)
• Fix for rep_times as a float, now it's an integer (#2438)
• Fix type error for integer framechange instructions (#2458)
• Fix for missing cython source files in sdist (#2436)
• Fix for different pulse schedules created with the same name (#2431)
• Only create a single AquireInstruction for all qubits (#2485)
• Stop modifying layout in stochastic swap pass (#2507)
• Only call CXDirection pass on optimization_level=3 if coupling map is
  provided (#2526)
• Fix optimization_level=0 without a coupling map (#2509)

Qiskit Terra 0.8.0

0.8.0 - 2019-05-02

Added

• Added exact and approximate decomposition of SU(4) to arbitrary supercontrolled basis
• Introduced schedule lo configuration. (#2115)
• Introduced pulse schedule assembler. (#2115)
• Builtin library of continuous pulses and builtin library of discrete pulses which are obtained
  by sampling continuous pulses with default sampling strategy.
• Sampler decorator and standard sampler library for conversion of continuous pulses
  to discrete SamplePulse (#2042).
• Core StochasticSwap routine implimented in Cython (#1789).
• Added QuantumChannel classes SuperOp, Choi, Kraus, Stinespring, PTM, Chi to
  quantum_info for manipulating quantum channels and CPTP maps.
• Added Operator object to quantum_info for representing matrix operators.
• Introduced the backend defaults model and endpoint for pulse backends (#2101).
• meas_level to result schema (#2085).
• Core StochasticSwap routine implemented in Cython (#1789).
• New EnlargeWithAncilla pass for adding ancilla qubits after a Layout
  selection pass (#1603).
• New Unroll2Q pass for unrolling gates down to just 1q or 2q gates (#1614).
• Added support for register slicing when applying operations to a register (#1643).
• Added in new parameter justify to the text, mpl and latex circuit drawers to say how the
  circuit should be aligned. (#1725, #1797, #1977)
• Added function for purity of a mixed state in qiskit.quantum_information
  (#1733)
• Added parameter to the TextProgressBar to allow the output to be sent to a
  different output stream
• Added a __qiskit_version__ parameter to the qiskit namespace. This will
  contain a dictionary of versions for all installed qiskit elements. (#1885).
• Added a RunConfig object for configurations related to running an
  experiment (e.g. shots, memory) (#1856)
• Added a TranspileConfig object for configurations related to transforming
  circuits (e.g. basis_gates, coupling_map, initial_layout) (#1856)
• Added a qiskit.compiler namespace for all functions that transpile, schedule
  and assemble circuits and pulses (#1856)
• Added support for passing a list of basis_gates, coupling_map etc. to the
  qiskit.compiler.transpile() function, each corresponding to one of the circuits (#2163)
• Added a qiskit.compiler.assemble_circuits() function to generate qobj from some
  circuits and a RunConfig (#1856)
• execute() and assemble() allow setting a qobj_header, of type
  QobjHeader or dict, to add extra information to the qobj (and thus result).
• Register indexing supports negative indices (#1875)
• Added new resource estimation passes: Depth, Width, Size, CountOps, and
  NumTensorFactors, all grouped in the ResourceEstimation analysis pass.
• Added nodes_on_wire() to DAGCircuit which returns an iterator over all the
  operations on the given wire
• Added new properties to an Instruction:
  num_qubits, num_clbits (#1816).
• Added a QuantumCircuit.append public method for appending arbitrary instructions
  to some qubits and clbits in the circuit (#1816).
• Added an Instruction.definition property that defines a composite instruction
  in terms of other, simpler instructions (#1816).
• Added an Instruction.mirror() method that mirrors a composite instruction
  (reverses its sub-instructions) (#1816).
• Added an PassManager.passes() method that returns a list of the passes that
  have been added to the pass manager, including options and flow controllers.
• Added a PassManager.run() that transforms a QuantumCircuit according to its
  pass schedule and returns a QuantumCircuit.
• Added a qiskit.quantum_info.random for generating random states, unitaries, etc (#2119).
• Added a qiskit.quantum_info.synthesis for algorithms that synthesize circuits (#2119).
• Added a NoiseAdaptiveLayout pass to compute a backend calibration-data aware initial
  qubit layout. (#2089)
• Gates and instructions in a circuit accept integers as parameters to refer to
  wires instead of named bits.
• Added a OptimizeSwapBeforeMeasure pass that removes the swap gates when they
  are followed by a measurement instruction, moving the latter to the proper wire. (#1890)
• Added a RemoveDiagonalGatesBeforeMeasure pass that removes the diagonal gates when they
  are followed by a measurement instruction. (#2208)
• Added a CommutativeCancellation pass that cancels self-inverse gates and combines
  rotations about the Z axis, leveraging previously-found gate commutation relations. (#2012)
• Add an option for using a user config file to enable changing default
  settings for various functions in qiskit. Right now it only supports setting
  the default circuit drawing backend. (#2122)
• Added a Collect2qBlocks pass that analyzes the circuit for uninterrupted sequences
  of gates (blocks) acting on 2 qubits. (#2134)
• Added a ConsolidateBlocks that turns previously-collected blocks of any size
  into equivalent Unitary operators in the circuit. (#2134)
• Added support for parameterized circuits. (#2103)
• Added preset PassManagers that offer predetermined pipelines of transpiler passes. (#2163)

Changed

• require scipy>=1.0, use scipy.stats.unitary_group.rvs for random_unitary().
• two_qubit_kak decomposition works with Operator or raw matrix input objects.
• process_fidelity works with QuantumChannel and Operator object inputs.
• Backend defaults values are no longer required (#2101).
• QuantumCircuit properties more self-consistent and no longer need DAG (#1993).
• The most connected subset in DenseLayout is now reduced bandwidth (#2021).
• plot_histogram now allows sorting by Hamming distance from target_string (#2064).
• FunctionalPulse is no longer a class and instead is a decorator, functional_pulse
  that returns a SamplePulse when called. (#2043)
• Changed average_data to accept observable input in matrix form (#1858)
• Change random_state to take in dim over number of qubits (#1857)
• The Exception subclasses have been moved to an .exceptions module
  within each package (for example, qiskit.exceptions.QiskitError) (#1600).
• The QiskitTestCase and testing utilities are now included as part of
  qiskit.test and thus available for third-party implementations, with
  convenience test cases for providers and backends. (#1616, #1844)
• The snapshot instruction now takes label and snap_type instead of
  slot (#1615).
• The test folders have been reorganized to match the python modules (#1625)
• The circuits_to_qobj no longers uses the unrollers (#1629)
• The previously deprecated default output of circuit_drawer() (using latex
  and falling back to mpl) is no longer present. Instead the default output
  is the ascii art text output backend.
• Changed param to params in Instruction (#1665).
• dag_drawer and plot_gate_map are available via importing
  qiskit.tools.visualization. They will raise at the point of use, if
  dependencies are not installed (#1669).
• The qiskit.validation schemas are now strict and raise a more specific
  ModelValidationError (#1695).
• The default transpile pipeline will now add a barrier before the set of
  final measurements when compiling for both simulators and devices (#1591).
• Purity function in qiskit.tools.qi.qi calls new version in
  qiskit.quantum_information and issues deprecation warning (#1733)
• Updated dag.node_counter to return the current number of nodes (#1763)
• The argument basis_gates used in compile, execute, and transpile
  is not longer a comma-separated string but a list of strings. For example,
  this basis ['u1','u2','u3','cx'] should be used instead of 'u1,u2,u3,cx'
  (#1333)
• Methods on the DAGCircuit which previously returned node_ids and/or dicts now
  return DAGNodes
• The Qobj classes have been reimplemented using models and schemas, as the
  rest of spec-defined entities. (#1909).
• The rzz gate is now represented as a line when printed in text (#1957).
• Text drawer has support for multi-q gates (#1939).
• Separate Qobj into PulseQobj and QasmQobj (#1969).
• It is possible to define a layout as a list of integers. This maps the ordered list
  of virtual circuit qubits to physical qubits as defined by the list of integers (#1946).
• Instructions no longer have context about where they are in a circuit. Instead,
  the circuit keeps this context. So Instructions are now light-weight and only
  have a name, num_qubits, num_clbits and params (#1816).
• The old syntax for attaching a gate to the circuit then modifying it is no longer
  supported (e.g. circuit.s(qr).inverse() or circuit.s(qr).c_if(cr, 4)).
  Instead, you must first modify the gate then attach it (#1816).
• QuantumCircuit.data now contains a list of tuples, where each tuple is a
  (instruction, qarg, carg) (#1816).
• The visualization subpackage has moved from qiskit.tools.visualization to
  qiskit.visualization. The public API (which was declared stable in
  the 0.7 release) is still accessible off of qiskit.tools.visualization.
  (#1878)
• Layout object can now only be constructed from a dictionary, and must be bijective (#2157).
• transpile() accepts initial_layout in the form of dict, list or Layout (#2157).
• Not specifying a basis in execute() or transpile() no longer defaults to unrolling
  to the ['u1', 'u2', 'u3', 'cx'] basis. Instead the default behavior is to not unroll,
  unless specifically requested (#2166).
• Instruction.copy() is now a shallow copy instead of deep (#2214)
• Layout and CouplingMap classes are now accessible from qiskit.tran...

Qiskit Terra 0.7.2

Changelog

Fixed

• A potential issue where the backend configuration schema validation would
  improperly reject valid responses from the API (#2258)