SparseObservable evolution
#13836
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SparseObservable evolution
#13836
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mtreinish
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Feb 13, 2025
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| def _sparse_term_label(term): | ||
| return "".join(BIT_LABELS[bit] for bit in reversed(term.bit_terms)) |
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I feel like we should do this in Rust as a pyfunction because it'd be faster and we could use the enum variants for BitTerm directly. Not that it really matters, but it feels more natural in rust.
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I was thinking of adding a method to SparseTerm, maybe something like bit_labels() or so. But a standalone function would ofc also work
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| // .map(|(gate, params, qargs)| { | ||
| // (gate.into(), params, qargs.to_vec(), vec![] as Vec<Clbit>) | ||
| // }) | ||
| // .collect::<Vec<Instruction>>(); |
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Suggested change
| // .map(|(gate, params, qargs)| { | |
| // (gate.into(), params, qargs.to_vec(), vec![] as Vec<Clbit>) | |
| // }) | |
| // .collect::<Vec<Instruction>>(); |
mtreinish
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Changelog: New Feature
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Summary
Add support for
SparseObservableinPauliEvolution.Details and comments
Evolution under projectors is implemented by controlling the target rotation with open controls (for +1 eigenstate projectors) or closed controls (for -1 eigenstate projectors). This is significantly more efficient than decomposing projectors into Paulis, shown here for the implementation of$exp(-i t Z \otimes |1\rangle\langle 1|^{\otimes n})$ for different numbers of projectors $n$ .