New features since last release
Registers of wires 🧸
-
A new function called
qml.registers
has been added that lets you seamlessly create registers of wires. (#5957) (#6102)Using registers, it is easier to build large algorithms and circuits by applying gates and operations to predefined collections of wires. With
qml.registers
, you can create registers of wires by providing a dictionary whose keys are register names and whose values are the number of wires in each register.>>> wire_reg = qml.registers({"alice": 4, "bob": 3}) >>> wire_reg {'alice': Wires([0, 1, 2, 3]), 'bob': Wires([4, 5, 6])}
The resulting data structure of
qml.registers
is a dictionary with the same register names as keys, but the values areqml.wires.Wires
instances.Nesting registers within other registers can be done by providing a nested dictionary, where the ordering of wire labels is based on the order of appearance and nestedness.
>>> wire_reg = qml.registers({"alice": {"alice1": 1, "alice2": 2}, "bob": {"bob1": 2, "bob2": 1}}) >>> wire_reg {'alice1': Wires([0]), 'alice2': Wires([1, 2]), 'alice': Wires([0, 1, 2]), 'bob1': Wires([3, 4]), 'bob2': Wires([5]), 'bob': Wires([3, 4, 5])}
Since the values of the dictionary are
Wires
instances, their use within quantum circuits is very similar to that of alist
of integers.dev = qml.device("default.qubit") @qml.qnode(dev) def circuit(): for w in wire_reg["alice"]: qml.Hadamard(w) for w in wire_reg["bob1"]: qml.RX(0.1967, wires=w) qml.CNOT(wires=[wire_reg["alice1"][0], wire_reg["bob2"][0]]) return [qml.expval(qml.Y(w)) for w in wire_reg["bob1"]] print(qml.draw(circuit)())
0: ──H────────╭●─┤ 1: ──H────────│──┤ 2: ──H────────│──┤ 3: ──RX(0.20)─│──┤ <Y> 4: ──RX(0.20)─│──┤ <Y> 5: ───────────╰X─┤
In tandem with
qml.registers
, we've also made the following improvements toqml.wires.Wires
:-
Wires
instances now have a more copy-paste friendly representation when printed. (#5958)>>> from pennylane.wires import Wires >>> w = Wires([1, 2, 3]) >>> w Wires([1, 2, 3])
-
Python set-based combinations are now supported by
Wires
. (#5983)This new feature unlocks the ability to combine
Wires
instances in the following ways:-
intersection with
&
orintersection()
:>>> wires1 = Wires([1, 2, 3]) >>> wires2 = Wires([2, 3, 4]) >>> wires1.intersection(wires2) # or wires1 & wires2 Wires([2, 3])
-
symmetric difference with
^
orsymmetric_difference()
:>>> wires1.symmetric_difference(wires2) # or wires1 ^ wires2 Wires([1, 4])
-
union with
|
orunion()
:>>> wires1.union(wires2) # or wires1 | wires2 Wires([1, 2, 3, 4])
-
difference with
-
ordifference()
:>>> wires1.difference(wires2) # or wires1 - wires2 Wires([1])
-
-
Quantum arithmetic operations 🧮
-
Several new operator templates have been added to PennyLane that let you perform quantum arithmetic operations. (#6109) (#6112) (#6121)
-
qml.Adder
performs in-place modular addition: $\text{Adder}(k, m)\vert x \rangle = \vert x + k ; \text{mod} ; m\rangle$. -
qml.PhaseAdder
is similar toqml.Adder
, but it performs in-place modular addition in the Fourier basis. -
qml.Multiplier
performs in-place multiplication: $\text{Multiplier}(k, m)\vert x \rangle = \vert x \times k ; \text{mod} ; m \rangle$. -
qml.OutAdder
performs out-place modular addition: $\text{OutAdder}(m)\vert x \rangle \vert y \rangle \vert b \rangle = \vert x \rangle \vert y \rangle \vert b + x + y ; \text{mod} ; m \rangle$. -
qml.OutMultiplier
performs out-place modular multiplication: $\text{OutMultiplier}(m)\vert x \rangle \vert y \rangle \vert b \rangle = \vert x \rangle \vert y \rangle \vert b + x \times y ; \text{mod} ; m \rangle$. -
qml.ModExp
performs modular exponentiation: $\text{ModExp}(base, m) \vert x \rangle \vert k \rangle = \vert x \rangle \vert k \times base^x ; \text{mod} ; m \rangle$.
Here is a comprehensive example that performs the following calculation:
(2 + 1) * 3 mod 7 = 2
(or010
in binary).dev = qml.device("default.qubit", shots=1) wire_reg = qml.registers({ "x_wires": 2, # |x>: stores the result of 2 + 1 = 3 "y_wires": 2, # |y>: multiples x by 3 "output_wires": 3, # stores the result of (2 + 1) * 3 m 7 = 2 "work_wires": 2 # for qml.OutMultiplier }) @qml.qnode(dev) def circuit(): # In-place addition qml.BasisEmbedding(2, wires=wire_reg["x_wires"]) qml.Adder(1, x_wires=wire_reg["x_wires"]) # add 1 to wires [0, 1] # Out-place multiplication qml.BasisEmbedding(3, wires=wire_reg["y_wires"]) qml.OutMultiplier( wire_reg["x_wires"], wire_reg["y_wires"], wire_reg["output_wires"], work_wires=wire_reg["work_wires"], mod=7 ) return qml.sample(wires=wire_reg["output_wires"])
>>> circuit() array([0, 1, 0])
-
Converting noise models from Qiskit ♻️
-
Convert Qiskit noise models into a PennyLane
NoiseModel
withqml.from_qiskit_noise
. (#5996)In the last few releases, we've added substantial improvements and new features to the Pennylane-Qiskit plugin. With this release, a new
qml.from_qiskit_noise
function allows you to convert a Qiskit noise model into a PennyLaneNoiseModel
. Here is a simple example with two quantum errors that add two different depolarizing errors based on the presence of different gates in the circuit:import pennylane as qml import qiskit_aer.noise as noise error_1 = noise.depolarizing_error(0.001, 1) # 1-qubit noise error_2 = noise.depolarizing_error(0.01, 2) # 2-qubit noise noise_model = noise.NoiseModel() noise_model.add_all_qubit_quantum_error(error_1, ['rz', 'ry']) noise_model.add_all_qubit_quantum_error(error_2, ['cx'])
>>> qml.from_qiskit_noise(noise_model) NoiseModel({ OpIn(['RZ', 'RY']): QubitChannel(num_kraus=4, num_wires=1) OpIn(['CNOT']): QubitChannel(num_kraus=16, num_wires=2) })
Under the hood, PennyLane converts each quantum error in the Qiskit noise model into an equivalent
qml.QubitChannel
operator with the same canonical Kraus representation. Currently, noise models in PennyLane do not support readout errors. As such, those will be skipped during conversion if they are present in the Qiskit noise model.Make sure to
pip install pennylane-qiskit
to access this new feature!
Substantial upgrades to mid-circuit measurements using tree-traversal 🌳
-
The
"tree-traversal"
algorithm for mid-circuit measurements (MCMs) ondefault.qubit
has been internally redesigned for better performance. (#5868)In the last release (v0.37), we introduced the tree-traversal MCM method, which was implemented in a recursive way for simplicity. However, this had the unintended consequence of very deep stack calls for circuits with many MCMs, resulting in stack overflows in some cases. With this release, we've refactored the implementation of the tree-traversal method into an iterative approach, which solves those inefficiencies when many MCMs are present in a circuit.
-
The
tree-traversal
algorithm is now compatible with analytic-mode execution (shots=None
). (#5868)dev = qml.device("default.qubit") n_qubits = 5 @qml.qnode(dev, mcm_method="tree-traversal") def circuit(): for w in range(n_qubits): qml.Hadamard(w) for w in range(n_qubits - 1): qml.CNOT(wires=[w, w+1]) for w in range(n_qubits): m = qml.measure(w) qml.cond(m == 1, qml.RX)(0.1967 * (w + 1), w) return [qml.expval(qml.Z(w)) for w in range(n_qubits)]
>>> circuit() [tensor(0.00964158, requires_grad=True), tensor(0.03819446, requires_grad=True), tensor(0.08455748, requires_grad=True), tensor(0.14694258, requires_grad=True), tensor(0.2229438, requires_grad=True)]
Improvements 🛠
Creating spin Hamiltonians
-
Three new functions are now available for creating commonly-used spin Hamiltonians in PennyLane: (#6106) (#6128)
qml.spin.transverse_ising
creates the transverse-field Ising model Hamiltonian.qml.spin.heisenberg
creates the Heisenberg model Hamiltonian.qml.spin.fermi_hubbard
creates the Fermi-Hubbard model Hamiltonian.
Each Hamiltonian can be instantiated by specifying a
lattice
, the number of unit cells,n_cells
, and the Hamiltonian parameters as keyword arguments. Here is an example with the transverse-field Ising model:>>> tfim_ham = qml.spin.transverse_ising(lattice="square", n_cells=[2, 2], coupling=0.5, h=0.2) >>> tfim_ham ( -0.5 * (Z(0) @ Z(1)) + -0.5 * (Z(0) @ Z(2)) + -0.5 * (Z(1) @ Z(3)) + -0.5 * (Z(2) @ Z(3)) + -0.2 * X(0) + -0.2 * X(1) + -0.2 * X(2) + -0.2 * X(3) )
The resulting object is a
qml.Hamiltonian
instance, making it easy to use in circuits like the following.dev = qml.device("default.qubit", shots=1) @qml.qnode(dev) def circuit(): return qml.expval(tfim_ham)
>>> circuit() -2.0
More features will be added to the
qml.spin
module in the coming releases, so stay tuned!
A Prep-Select-Prep template
-
A new template called
qml.PrepSelPrep
has been added that implements a block-encoding of a linear combination of unitaries. (#5756) (#5987)This operator acts as a nice wrapper for having to perform
qml.StatePrep
,qml.Select
, andqml.adjoint(qml.StatePrep)
in succession, which is quite common in many quantum algorithms (e.g., LCU and block encoding). Here is an example showing the equivalence between usingqml.PrepSelPrep
andqml.StatePrep
,qml.Select
, andqml.adjoint(qml.StatePrep)
.coeffs = [0.3, 0.1] alphas = (np.sqrt(coeffs) / np.linalg.norm(np.sqrt(coeffs))) unitaries = [qml.X(2), qml.Z(2)] lcu = qml.dot(coeffs, unitaries) control = [0, 1] def prep_sel_prep(alphas, unitaries): qml.StatePrep(alphas, wires=control, pad_with=0) qml.Select(unitaries, control=control) qml.adjoint(qml.StatePrep)(alphas, wires=control, pad_with=0) @qml.qnode(qml.device("default.qubit")) def circuit(lcu, control, alphas, unitaries): qml.PrepSelPrep(lcu, control) qml.adjoint(prep_sel_prep)(alphas, unitaries) return qml.state()
>>> import numpy as np >>> np.round(circuit(lcu, control, alphas, unitaries), decimals=2) tensor([1.+0.j -0.+0.j -0.+0.j -0.+0.j 0.+0.j 0.+0.j 0.+0.j 0.+0.j], requires_grad=True)
QChem improvements
-
Molecules and Hamiltonians can now be constructed for all the elements present in the periodic table. (#5821)
This new feature is made possible by integrating with the basis-set-exchange package. If loading basis sets from
basis-set-exchange
is needed for your molecule, make sure that youpip install basis-set-exchange
and setload_data=True
.symbols = ['Ti', 'Ti'] geometry = np.array([[0.0, 0.0, -1.1967], [0.0, 0.0, 1.1967]], requires_grad=True) mol = qml.qchem.Molecule(symbols, geometry, load_data=True)
>>> mol.n_electrons 44
-
qml.UCCSD
now accepts an additional optional argument,n_repeats
, which defines the number of times the UCCSD template is repeated. This can improve the accuracy of the template by reducing the Trotter error, but would result in deeper circuits. (#5801) -
The
qml.qchem.qubit_observable
function has been modified to return an ascending wire order for molecular Hamiltonians. (#5950) -
A new method called
to_mat
has been added to theqml.FermiWord
andqml.FermiSentence
classes, which allows for computing the matrix representation of these Fermi operators. (#5920)
Improvements to operators
-
qml.GlobalPhase
now supports parameter broadcasting. (#5923) -
qml.Hermitian
now has acompute_decomposition
method. (#6062) -
The implementation of
qml.PhaseShift
,qml.S
, andqml.T
has been improved, resulting in faster circuit execution times. (#5876) -
The
qml.CNOT
operator no longer decomposes into itself. Instead, it raises aqml.DecompositionUndefinedError
. (#6039)
Mid-circuit measurements
-
The
qml.dynamic_one_shot
transform now supports circuits using the"tensorflow"
interface. (#5973) -
If the conditional does not include a mid-circuit measurement, then
qml.cond
will automatically evaluate conditionals using standard Python control flow. (#6016)This allows
qml.cond
to be used to represent a wider range of conditionals:dev = qml.device("default.qubit", wires=1) @qml.qnode(dev) def circuit(x): c = qml.cond(x > 2.7, qml.RX, qml.RZ) c(x, wires=0) return qml.probs(wires=0)
>>> print(qml.draw(circuit)(3.8)) 0: ──RX(3.80)─┤ Probs >>> print(qml.draw(circuit)(0.54)) 0: ──RZ(0.54)─┤ Probs
Transforms
-
qml.transforms.single_qubit_fusion
andqml.transforms.merge_rotations
now respect global phases. (#6031) -
A new transform called
qml.transforms.diagonalize_measurements
has been added. This transform converts measurements to the computational basis by applying the relevant diagonalizing gates. It can be set to diagonalize only a subset of the base observables{qml.X, qml.Y, qml.Z, qml.Hadamard}
. (#5829) -
A new transform called
split_to_single_terms
has been added. This transform splits expectation values of sums into multiple single-term measurements on a single tape, providing better support for simulators that can handle non-commuting observables but don't natively support multi-term observables. (#5884) -
New functionality has been added to natively support exponential extrapolation when using
qml.transforms.mitigate_with_zne
. This allows users to have more control over the error mitigation protocol without needing to add further dependencies. (#5972)
Capturing and representing hybrid programs
-
qml.for_loop
now supportsrange
-like syntax with defaultstep=1
. (#6068) -
Applying
adjoint
andctrl
to a quantum function can now be captured into plxpr. Furthermore, theqml.cond
function can be captured into plxpr. (#5966) (#5967) (#5999) (#6058) -
During experimental program capture, functions that accept and/or return
pytree
structures can now be handled in theqml.QNode
call,qml.cond
,qml.for_loop
andqml.while_loop
. (#6081) -
During experimental program capture, QNodes can now use closure variables. (#6052)
-
Mid-circuit measurements can now be captured with
qml.capture
enabled. (#6015) -
qml.for_loop
can now be captured into plxpr. (#6041) (#6064) -
qml.for_loop
andqml.while_loop
now fall back to standard Python control flow if@qjit
is not present, allowing the same code to work with and without@qjit
without any rewrites. (#6014)dev = qml.device("lightning.qubit", wires=3) @qml.qnode(dev) def circuit(x, n): @qml.for_loop(0, n, 1) def init_state(i): qml.Hadamard(wires=i) init_state() @qml.for_loop(0, n, 1) def apply_operations(i, x): qml.RX(x, wires=i) @qml.for_loop(i + 1, n, 1) def inner(j): qml.CRY(x**2, [i, j]) inner() return jnp.sin(x) apply_operations(x) return qml.probs()
>>> print(qml.draw(circuit)(0.5, 3)) 0: ──H──RX(0.50)─╭●────────╭●──────────────────────────────────────┤ Probs 1: ──H───────────╰RY(0.25)─│──────────RX(0.48)─╭●──────────────────┤ Probs 2: ──H─────────────────────╰RY(0.25)───────────╰RY(0.23)──RX(0.46)─┤ Probs >>> circuit(0.5, 3) array([0.125 , 0.125 , 0.09949758, 0.15050242, 0.07594666, 0.11917543, 0.08942104, 0.21545687]) >>> qml.qjit(circuit)(0.5, 3) Array([0.125 , 0.125 , 0.09949758, 0.15050242, 0.07594666, 0.11917543, 0.08942104, 0.21545687], dtype=float64)
Community contributions 🥳
-
Fixed a bug in
qml.ThermalRelaxationError
where there was a typo fromtq
totg
. (#5988) -
Readout error has been added using parameters
readout_relaxation_probs
andreadout_misclassification_probs
on thedefault.qutrit.mixed
device. These parameters add aqml.QutritAmplitudeDamping
and aqml.TritFlip
channel, respectively, after measurement diagonalization. The amplitude damping error represents the potential for relaxation to occur during longer measurements. The trit flip error represents misclassification during readout. (#5842) -
qml.ops.qubit.BasisStateProjector
now has acompute_sparse_matrix
method that computes the sparse CSR matrix representation of the projector onto the given basis state. (#5790)
Other improvements
-
qml.pauli.group_observables
now usesrustworkx
colouring algorithms to solve the Minimum Clique Cover problem, resulting in orders of magnitude performance improvements. (#6043)This adds two new options for the
method
argument:dsatur
(degree of saturation) andgis
(independent set). In addition, the creation of the adjacency matrix now takes advantage of the symplectic representation of the Pauli observables.Additionally, a new function called
qml.pauli.compute_partition_indices
has been added to calculate the indices from the partitioned observables more efficiently. These changes improve the wall time ofqml.LinearCombination.compute_grouping
and thegrouping_type='qwc'
by orders of magnitude. -
qml.counts
measurements withall_outcomes=True
can now be used with JAX jitting. Additionally, measurements broadcasted across all available wires (e.g.,qml.probs()
) can now be used with JAX jit and devices that allow dynamic numbers of wires (only'default.qubit'
currently). (#6108) -
qml.ops.op_math.ctrl_decomp_zyz
can now decompose special unitaries with multiple control wires. (#6042) -
A new method called
process_density_matrix
has been added to theProbabilityMP
andDensityMatrixMP
measurement processes, allowing for more efficient handling of quantum density matrices, particularly with batch processing support. This method simplifies the calculation of probabilities from quantum states represented as density matrices. (#5830) -
SProd.terms
now flattens out the terms if the base is a multi-term observable. (#5885) -
qml.QNGOptimizer
now supports cost functions with multiple arguments, updating each argument independently. (#5926) -
semantic_version
has been removed from the list of required packages in PennyLane. (#5836) -
qml.devices.LegacyDeviceFacade
has been added to map the legacy devices to the new device interface, making it easier for developers to develop legacy devices. (#5927) -
StateMP.process_state
now defines rules incast_to_complex
for complex casting, avoiding a superfluous statevector copy in PennyLane-Lightning simulations. (#5995) -
QuantumScript.hash
is now cached, leading to performance improvements. (#5919) -
Observable validation for
default.qubit
is now based on execution mode (analytic vs. finite shots) and measurement type (sample measurement vs. state measurement). This improves our error handling when, for example, non-hermitian operators are given toqml.expval
. (#5890) -
A new
is_leaf
parameter has been added to the functionflatten
in theqml.pytrees
module. This is to allow for node flattening to be stopped for any node where theis_leaf
optional argument evaluates to beingTrue
. (#6107) -
A progress bar has been added to
qml.data.load()
when downloading a dataset. (#5560) -
Upgraded and simplified
StatePrep
andAmplitudeEmbedding
templates. (#6034) (#6170) -
Upgraded and simplified
BasisState
andBasisEmbedding
templates. (#6021)
Breaking changes 💔
-
MeasurementProcess.shape(shots: Shots, device:Device)
is nowMeasurementProcess.shape(shots: Optional[int], num_device_wires:int = 0)
. This has been done to allow for jitting when a measurement is broadcasted across all available wires, but the device does not specify wires. (#6108) -
If the shape of a probability measurement is affected by a
Device.cutoff
property, it will no longer work with jitting. (#6108) -
qml.GlobalPhase
is considered non-differentiable with tape transforms. As a consequence,qml.gradients.finite_diff
andqml.gradients.spsa_grad
no longer support differentiatingqml.GlobalPhase
with state-based outputs. (#5620) -
The
CircuitGraph.graph
rustworkx
graph now stores indices into the circuit as the node labels, instead of the operator/ measurement itself. This allows the same operator to occur multiple times in the circuit. (#5907) -
The
queue_idx
attribute has been removed from theOperator
,CompositeOp
, andSymbolicOp
classes. (#6005) -
qml.from_qasm
no longer removes measurements from the QASM code. Usemeasurements=[]
to remove measurements from the original circuit. (#5982) -
qml.transforms.map_batch_transform
has been removed, since transforms can be applied directly to a batch of tapes. Seeqml.transform
for more information. (#5981) -
QuantumScript.interface
has been removed. (#5980)
Deprecations 👋
-
The
decomp_depth
argument inqml.device
has been deprecated. (#6026) -
The
max_expansion
argument inqml.QNode
has been deprecated. (#6026) -
The
expansion_strategy
attributeqml.QNode
has been deprecated. (#5989) -
The
expansion_strategy
argument has been deprecated in all ofqml.draw
,qml.draw_mpl
, andqml.specs
. Thelevel
argument should be used instead. (#5989) -
Operator.expand
has been deprecated. Users should simply useqml.tape.QuantumScript(op.decomposition())
for equivalent behaviour. (#5994) -
qml.transforms.sum_expand
andqml.transforms.hamiltonian_expand
have been deprecated. Users should instead useqml.transforms.split_non_commuting
for equivalent behaviour. (#6003) -
The
expand_fn
argument inqml.execute
has been deprecated. Instead, please create aqml.transforms.core.TransformProgram
with the desired preprocessing and pass it to thetransform_program
argument ofqml.execute
. (#5984) -
The
max_expansion
argument inqml.execute
has been deprecated. Instead, please useqml.devices.preprocess.decompose
with the desired expansion level, add it to aqml.transforms.core.TransformProgram
and pass it to thetransform_program
argument ofqml.execute
. (#5984) -
The
override_shots
argument inqml.execute
has been deprecated. Instead, please add the shots to theQuantumTape
s to be executed. (#5984) -
The
device_batch_transform
argument inqml.execute
has been deprecated. Instead, please create aqml.transforms.core.TransformProgram
with the desired preprocessing and pass it to thetransform_program
argument ofqml.execute
. (#5984) -
qml.qinfo.classical_fisher
andqml.qinfo.quantum_fisher
have been deprecated. Instead, useqml.gradients.classical_fisher
andqml.gradients.quantum_fisher
. (#5985) -
The legacy devices
default.qubit.{autograd,torch,tf,jax,legacy}
have been deprecated. Instead, usedefault.qubit
, as it now supports backpropagation through the several backends. (#5997) -
The logic for internally switching a device for a different backpropagation compatible device is now deprecated, as it was in place for the deprecated
default.qubit.legacy
. (#6032)
Documentation 📝
-
The docstring for
qml.qinfo.quantum_fisher
, regarding the internally used functions and potentially required auxiliary wires, has been improved. (#6074) -
The docstring for
QuantumScript.expand
andqml.tape.tape.expand_tape
has been improved. (#5974)
Bug fixes 🐛
-
The sparse matrix can now be computed for a product operator when one operand is a
GlobalPhase
on no wires. (#6197) -
For
default.qubit
, JAX is now used for sampling whenever the state is a JAX array. This fixes normalization issues that can occur when the state uses 32-bit precision. (#6190) -
Fix Pytree serialization of operators with empty shot vectors (#6155)
-
Fixes an error in the
dynamic_one_shot
transform when used with sampling a single shot. (#6149) -
qml.transforms.pattern_matching_optimization
now preserves the tape measurements. (#6153) -
qml.transforms.broadcast_expand
no longer squeezes out batch sizes of size 1, as a batch size of 1 is still a batch size. (#6147) -
Catalyst replaced
argnum
withargnums
in gradient related functions, therefore we updated the Catalyst calls to those functions in PennyLane. (#6117) -
fuse_rot_angles
now returns NaN instead of incorrect derivatives at singular points. (#6031) -
qml.GlobalPhase
andqml.Identity
can now be captured with plxpr when acting on no wires. (#6060) -
Fixed
jax.grad
andjax.jit
to work forqml.AmplitudeEmbedding
,qml.StatePrep
andqml.MottonenStatePreparation
. (#5620) -
Fixed a bug in
qml.center
that omitted elements from the center if they were linear combinations of input elements. (#6049) -
Fix a bug where the global phase returned by
one_qubit_decomposition
gained a broadcasting dimension. (#5923) -
Fixed a bug in
qml.SPSAOptimizer
that ignored keyword arguments in the objective function. (#6027) -
Fixed
dynamic_one_shot
for use with devices using the old device API, sinceoverride_shots
was deprecated. (#6024) -
CircuitGraph
can now handle circuits with the same operation instance occuring multiple times. (#5907) -
qml.QSVT
has been updated to store wire order correctly. (#5959) -
qml.devices.qubit.measure_with_samples
now returns the correct result if the provided measurements contain a sum of operators acting on the same wire. (#5978) -
qml.AmplitudeEmbedding
has better support for features using low precision integer data types. (#5969) -
qml.BasisState
andqml.BasisEmbedding
now works with jax.jit,lightning.qubit
, and give the correct decomposition. (#6021) -
Jacobian shape has been fixed for measurements with dimension in
qml.gradients.vjp.compute_vjp_single
. (5986) -
qml.lie_closure
now works with sums of Paulis. (#6023) -
Workflows that parameterize the coefficients of
qml.exp
are now jit-compatible. (#6082) -
Fixed a bug where
CompositeOp.overlapping_ops
changes the original ordering of operators, causing an incorrect matrix to be generated forProd
withSum
as operands. (#6091) -
qml.qsvt
now works with "Wx" convention and any number of angles. (#6105) -
Basis set data from the Basis Set Exchange library can now be loaded for elements with
SPD
-type orbitals. (#6159)
Contributors ✍️
This release contains contributions from (in alphabetical order):
Tarun Kumar Allamsetty, Guillermo Alonso, Ali Asadi, Utkarsh Azad, Tonmoy T. Bhattacharya, Gabriel Bottrill, Jack Brown, Ahmed Darwish, Astral Cai, Yushao Chen, Ahmed Darwish, Diksha Dhawan Maja Franz, Lillian M. A. Frederiksen, Pietropaolo Frisoni, Emiliano Godinez, Austin Huang, Renke Huang, Josh Izaac, Soran Jahangiri, Korbinian Kottmann, Christina Lee, Jorge Martinez de Lejarza, William Maxwell, Vincent Michaud-Rioux, Anurav Modak, Mudit Pandey, Andrija Paurevic, Erik Schultheis, nate stemen, David Wierichs,