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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).
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 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.
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.transpiler (#2222).
Deprecated
The methods prefixed by _get in the DAGCircuit object are being renamed
without that prefix (see #1346)
Changed elements in couplinglist of CouplingMap from tuples to lists
(#1666).
Unroller bases must now be explicit, and violation raises an informative QiskitError (#1802).
The qiskit.tools.qcvv package is deprecated in favor of Qiskit Ignis (#1884).
The qiskit.compile() function is now deprecated in favor of explicitly
using the qiskit.compiler.transpile() function to transform a circuit followed
by qiskit.compiler.assemble() to make a qobj out of it.
qiskit.converters.qobj_to_circuits() has been deprecated and will be
removed in a future release. Instead qiskit.compiler.disassemble_circuits() should be used to extract QuantumCircuit objects from a compiled qobj. (#2137)
The qiskit.transpiler.transpile() function is deprecated in favor of qiskit.compiler.transpile() (#2166).
The seed_mapper argument in transpile() and execute() is deprecated in favor of seed_transpile(), which sets the seed for all stochastic stages of the transpiler (#2166).
The seed argument is execute() is deprecated in favor of seed_simulator (#2166).
The pass_manager argument in transpile() is deprecated. Instead, the pass_manager.run() methdod can be used directly to transform the circuit (#2166).
The qiskit._util module is deprecated and replaced by qiskit.util. qiskit._util will be removed in the 0.9 release. (#2154)
Fixed
Fixed #1892, whereby inheriting from QuantumRegister or ClassicalRegister would
cause a QiskitError in instruction.py (#1908).
Fixed #829 by removing dependence on scipy unitary_group (#1857).
Fixed a bug with measurement sampling optimization in BasicAer
qasm_simulator (#1624).
Fixed a bug where barriers didn't plot over all qubits when using matplotlib (#1718).
Fixed a bug in BasicMapper pass operating over multiple registers (#1611).
Fixed a bug in BarrierBeforeFinalMeasurements which incorrectly moved measurements
used in conditional operations (#1705).
Fixed a bug that with transpile ignoring initial layout when
coupling map is provided (#1711).
Fixed a bug in the definition of the rzz gate (#1940).
Fixed a bug in DAGCircuit.collect_runs() that did not exclude conditional gates (#1943).
Fixed a mapping issue with layouts on non-adjacent qubits, by adding ancillas (#2023).
Fixed a bug in which an initial_layout could be changed even if it made the circuit
compatible with the device coupling_map (#2036).
Fixed qobj_to_circuits for circuits that contain initialize instructions
(#2138)
Removed
The previously deprecated functions plot_circuit(), latex_circuit_drawer(), generate_latex_source(), and matplotlib_circuit_drawer() from qiskit.tools.visualization have
been removed. The circuit_drawer() function from the same module should
be used instead.
The previously deprecated keys plot_barriers and reverse_bits keys in
the style kwarg dict are deprecated, instead the qiskit.tools.visualization.circuit_drawer() kwargs plot_barriers and reverse_bits should be used instead.
Removed the wrapper folder as part of the post 0.7 cleanup (#1613).
Removed the python wrappers of the legacy simualtors now that
Qiskit Aer is out (#1615).
Removed simulator instructions save, load, wait, noise
as unsupported in Aer (#1615).
