Add PiecewiseChebyshev arithmetic circuit #5364
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Cryoris
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Dec 18, 2020
Co-authored-by: Julien Gacon <gaconju@gmail.com>
Co-authored-by: Julien Gacon <gaconju@gmail.com>
Co-authored-by: Julien Gacon <gaconju@gmail.com>
Cryoris
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Dec 28, 2020
molar-volume
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Dec 29, 2020
* general polynomial approximation * release notes * fix qubit re-allocation * fix re-calling build * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * fix indentation lint error * move tests to library module * Add suggestions from code review Co-authored-by: Julien Gacon <gaconju@gmail.com>
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Jan 13, 2021
* 1. params are required in convert method in GradientBased and HessianBased subclasses 2. fix on handling params of type ParameterExpression * Update qiskit/opflow/gradients/gradient.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * passmanager(..., callback=...) parameter removed (#5522) * passmanager callback removal * unused-import * reno * better initial_layout validation (#5526) Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com> * 1) unit tests modified to test ParameterVector input for Gradient, NaturalGradient, QFI and Hessian 2) index method added to ParameterVector 3) handling of ParameterVector changed for Hessian to be consistent with list params * Hessian with respect to vector-like params returns matrix, unit test modified accordingly * Add PiecewiseChebyshev arithmetic circuit (#5364) * general polynomial approximation * release notes * fix qubit re-allocation * fix re-calling build * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * Update qiskit/circuit/library/arithmetic/piecewise_chebyshev.py Co-authored-by: Julien Gacon <gaconju@gmail.com> * fix indentation lint error * move tests to library module * Add suggestions from code review Co-authored-by: Julien Gacon <gaconju@gmail.com> * Ensure aux_operator eigenvalues are normalized (#5496) As reported on multiple occasions in Qiskit Aqua ([1], [2]), the eigenvalues of the auxiliary operators are not correctly normalized when the QASM backend is used. This commit fixes this short-coming by applying the same normalization to the VQE's eigenstate when obtained from a QASM backend (in which case this is a dictionary) as done by the `CircuitSampler` in its `sample_circuits` function. The case of the statevector backend is unaffected by this change, as it will return the eigenstate as a list. A unittest is added which asserts this behavior. [1]: https://github.com/Qiskit/qiskit-aqua/issues/1460 [2]: qiskit-community/qiskit-aqua#1467 Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> * Hessian with respect to vector-like param returns matrix, unit test modified accordingly Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: Luciano Bello <luciano.bello@ibm.com> Co-authored-by: Kevin Krsulich <kevin.krsulich@ibm.com> Co-authored-by: Almudena Carrera Vazquez <almudenacarreravazquez@hotmail.com> Co-authored-by: Max Rossmannek <oss@zurich.ibm.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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Summary
Adds the new feature to the arithmetic module.
Blocked on #5332
Details and comments
Given a function as an input, find a piecewise polynomial approximation with
numpy'sChebyshevmodule and implement it as Pauli rotations using thePiecewisePolynomialRotationsclass.