Add support for non-hermitian operators in AerPauliExpectation #7857
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Fixes Qiskit#415 QEOM creates a dictionary of operators to evaluate on the groundstate. When using the noisy simulators (qasm_simulator or aer_simulator), one could either use PauliExpectation (with noise) or AerPauliExpectation (without noise). PauliExpectation works with non-hermitian operators but internal methods of AerPauliExpectation raised an Error. This is a workaround to this limitation. Note that using include_custom=True on qasm allows the VQE to use a local AerPauliExpectation without using the "expectation" input. This does not apply to QEOM and one should explicitly define the "expectation" input of the VQE for it to apply globally.
Anthony-Gandon
requested review from
a team,
manoelmarques,
woodsp-ibm and
ikkoham
as code owners
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Hi Anthony, could you add a test that checks that the |
Cryoris
added
Changelog: New Feature
Fixes Qiskit#415 QEOM creates a dictionary of operators to evaluate on the groundstate. When using the noisy simulators (qasm_simulator or aer_simulator), one could either use PauliExpectation (with noise) or AerPauliExpectation (without noise). PauliExpectation works with non-hermitian operators but internal methods of AerPauliExpectation raised an Error. This is a workaround to this limitation. Note that using include_custom=True on qasm allows the VQE to use a local AerPauliExpectation without using the "expectation" input. This does not apply to QEOM and one should explicitly define the "expectation" input of the VQE for it to apply globally.
… into qeom_commit_aerpauliexpectation # Conflicts: # qiskit/opflow/expectations/aer_pauli_expectation.py
… into qeom_commit_aerpauliexpectation # Conflicts: # qiskit/opflow/expectations/aer_pauli_expectation.py
… into qeom_commit_aerpauliexpectation
… into qeom_commit_aerpauliexpectation # Conflicts: # test/python/opflow/test_aer_pauli_expectation.py
Cryoris
reviewed
Apr 1, 2022
Co-authored-by: Julien Gacon <gaconju@gmail.com>
Use a generator instead of list
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I changed the line giving the pylint error (I thought It was only a warning at first). Basically just all(k.is_hermitian() for k in ...) instead of all([k.is_hermitian() for k in ...]) |
Pull Request Test Coverage Report for Build 2115065714
💛 - Coveralls |
Cryoris
reviewed
Apr 7, 2022
releasenotes/notes/add-support-non-hermitian-op-aerpauliexpectation-653d8e16de4eca07.yaml
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| """pauli expect state vector with non hermitian operator test""" | ||
| states_op = ListOp([One, Zero, Plus, Minus]) | ||
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| op = np.array([[0, 1], [2, 3]]) |
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Should we add a test for other primitives than MatrixOp? What about e.g. 1j * Y as non-hermitian operator?
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A test case was added with the primitive PauliOp (I used 1jX because with 1jY all the expected values for Plus, Minus, 0, 1 were null). The names of the two test cases were adapted consequently.
Co-authored-by: Julien Gacon <gaconju@gmail.com>
…ation-653d8e16de4eca07.yaml Co-authored-by: Julien Gacon <gaconju@gmail.com>
Cryoris
reviewed
Apr 7, 2022
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| op = 1j * X | ||
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| converted_meas = self.expect.convert(~StateFn(op) @ states_op) |
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Using ~ will complex conjugate the observable, which we don't really want
Suggested change
| converted_meas = self.expect.convert(~StateFn(op) @ states_op) | |
| converted_meas = self.expect.convert(StateFn(op, is_measurement=True) @ states_op) |
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I agree with the commit and I changed the expected result from [0, 0, -1j, 1j] to [0, 0, 1j, -1j] to match this modification.
| op_mat = np.array([[0, 1], [2, 3]]) | ||
| op = MatrixOp(op_mat) | ||
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| converted_meas = self.expect.convert(~StateFn(op) @ states_op) |
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Suggested change
| converted_meas = self.expect.convert(~StateFn(op) @ states_op) | |
| converted_meas = self.expect.convert(StateFn(op, is_measurement=True) @ states_op) |
Cryoris
approved these changes
Apr 8, 2022
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Summary
QEOM creates a dictionary of operators to evaluate on the groundstate.
When using the noisy simulators (qasm_simulator or aer_simulator), one
could either use PauliExpectation (with noise) or AerPauliExpectation
(without noise). PauliExpectation works with non-hermitian operators
but internal methods of AerPauliExpectation raised an Error.
This is a workaround to this limitation.
Note that using include_custom=True on qasm allows the VQE to use a
local AerPauliExpectation without using the "expectation" input.
This does not apply to QEOM and one should explicitly define the
"expectation" input of the VQE for it to apply globally.