PauliEvolution gate #6975
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PauliEvolution gate #6975
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- add synthesis classes to imports - implement lie-trotter w/o opflow - PauliEvo shows as "exp(it <term>)"
and use HamiltonianGate instead of direct matrix evo
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Changelog: New Feature
woodsp-ibm
reviewed
Sep 9, 2021
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Needs a reno release note |
woodsp-ibm
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Sep 9, 2021
woodsp-ibm
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woodsp-ibm
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Co-authored-by: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
ajavadia
reviewed
Oct 29, 2021
Co-authored-by: Ali Javadi-Abhari <ajavadia@users.noreply.github.com>
- synthesize(self) - don't show `t` in evo-gate draw - delete pauli_evolution.py
ajavadia
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Oct 29, 2021
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Thanks for working on this @Cryoris. I made a couple small changes, the most notable being moving qiskit.circuit.synthesis one level up to qiskit.synthesis, as I really would like to separate circuit descriptions from how they are compiled. And this can be a folder to add new synthesis methods in for other high level objects.
It looks good to me now. There is a slight thing in the drawing that doesn't show the coeffs (so it shows e^iXX and e^-iXX as the same). But I couldn't find a good solution immediately, it can be a followup.
ajavadia
approved these changes
Oct 29, 2021
This was referenced Dec 14, 2021
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Summary
Implement an evolution gate for the evolution of sums (or sums of sums) of Paulis. The evolution gate is an opaque block containing all evolution information so the compiler can select do the synthesis and do optimizations.
Closes #6863.
Details and comments
In a nutshell:
PauliEvolutionGatecontains the evolution info (Operator and evolution time) and can be equipped with anEvolutionSynthesisto specify how to unroll. Eventually the compiler should select that.EvolutionSynthesisdetermines how to synthesize the evolution and for now includesLieTrotterandSuzukiTrotterMatrixExponentiationOptimizations we can do with this:
Design doc: https://gist.github.com/Cryoris/abc9753fd7dfb0cc3b3a83aa58a182e3