Makes measurement support degenerate states #2342
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hodgestar
reviewed
Feb 29, 2024
hodgestar
approved these changes
Mar 1, 2024
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Description
Measurement functions did not take into account degenerate states of the operator. (#1800, #2054)
Also the returned probabilities could be negative. (#2265)
I added a tolerance to these function for the minimal probability. Smaller / negative probabilities are rounded to
0.I also changed
measurement_statistics_observableto support degenerate operators: It always return the projectors, with projectors and probabilities of degenerate sub-systems summed. It also only return the (eigenvalues, projector, probability) set for cases where the probability is greater thantol.Related issues or PRs
fix #1800, #2054, #2029, #2265