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Opflow Cvar Implementation #1345
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Cvar isolated fix
…ua-grad into cvar-isolated
BryceFuller
requested review from
levbishop,
manoelmarques and
woodsp-ibm
as code owners
woodsp-ibm
reviewed
Oct 15, 2020
woodsp-ibm
reviewed
Oct 15, 2020
Cryoris
added
the
Changelog: New Feature
Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
woodsp-ibm
approved these changes
Oct 15, 2020
mtreinish
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that referenced
this pull request
Nov 20, 2020
* clean push w/o huge history * fix __new__ w/o changing StateFn.__new__ * update cvar statefn to latest verrsion * fix lint * alpha must be in [0,1] * add check that operators must be diagonal * cvar not used statefn.__new__ due to alpha * add small test file * add cvar expectation * fix spsa in case delta_obj=0 * rename cvar statefn to cvar measurement * add cvar expectation * wrote a release note for cvar and added comments to CVaRExpectation * changing docstring to try and prevent sphynx errors * Update releasenotes/notes/cvar-expectation-bbc2ccff95132b35.yaml * add more tests and fix coeff * allow ``add`` Co-authored-by: Cryoris <jules.gacon@googlemail.com> Co-authored-by: Julien Gacon <jul@zurich.ibm.com> Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
manoelmarques
pushed a commit
to manoelmarques/qiskit-terra
that referenced
this pull request
Dec 2, 2020
* clean push w/o huge history * fix __new__ w/o changing StateFn.__new__ * update cvar statefn to latest verrsion * fix lint * alpha must be in [0,1] * add check that operators must be diagonal * cvar not used statefn.__new__ due to alpha * add small test file * add cvar expectation * fix spsa in case delta_obj=0 * rename cvar statefn to cvar measurement * add cvar expectation * wrote a release note for cvar and added comments to CVaRExpectation * changing docstring to try and prevent sphynx errors * Update releasenotes/notes/cvar-expectation-bbc2ccff95132b35.yaml * add more tests and fix coeff * allow ``add`` Co-authored-by: Cryoris <jules.gacon@googlemail.com> Co-authored-by: Julien Gacon <jul@zurich.ibm.com> Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
manoelmarques
pushed a commit
to manoelmarques/qiskit-terra
that referenced
this pull request
Dec 7, 2020
* clean push w/o huge history * fix __new__ w/o changing StateFn.__new__ * update cvar statefn to latest verrsion * fix lint * alpha must be in [0,1] * add check that operators must be diagonal * cvar not used statefn.__new__ due to alpha * add small test file * add cvar expectation * fix spsa in case delta_obj=0 * rename cvar statefn to cvar measurement * add cvar expectation * wrote a release note for cvar and added comments to CVaRExpectation * changing docstring to try and prevent sphynx errors * Update releasenotes/notes/cvar-expectation-bbc2ccff95132b35.yaml * add more tests and fix coeff * allow ``add`` Co-authored-by: Cryoris <jules.gacon@googlemail.com> Co-authored-by: Julien Gacon <jul@zurich.ibm.com> Co-authored-by: Julien Gacon <gaconju@gmail.com> Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
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Summary
This PR adds a new StateFn object:
CVaRMeasurementwhich is a subclass ofOperatorStateFnand also modifies other opflow class methods to accommodate this new class.Details and comments
The
CVaRMeasurementobject is structurally very similar to anOperatorStateFnobject as it has aprimitiveattribute which acceptsOperatorBaseobjects. UnlikeOperatorStateFn, this object has a parameteralphain [0,1] which is used when computing the CVaR. For more details on CVaR in the context of quantum computing, see: https://arxiv.org/abs/1907.04769.