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[Stable] Fixed partial trace constraint in cvx fitting routine (#438) #440
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mtreinish
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Changelog: Bugfix
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chriseclectic
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Jun 24, 2020
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Summary
Fixes #437
Details and comments
When doing process tomography with the cvx method, one can include a constraint s.t. the resulting quantum channel will be trace preserving. Mathematically this constraint corresponds to the partial trace of the Choi matrix being the identity.
In the code, only the real part of the partial trace is compared with the identity, but not the imaginary part.
Backported from #438
(cherry picked from commit 3b72172)