Comments (1)
The improvement comes not from the symmetrization per se, but the fact the symmetrized errors in readout are easier to correct for.
The correct, IMHO, is OK to be performed at a higher level in the stack. Symmetrization should happen by inserting special instruction during compilation (similar to what you suggest), but also by coordinating with lower parts of the stack during execution. For that reason, others may want to chime in, in particular @caryan and @blakejohnson
Regarding the instructions you suggest, I would propose instead that
MEASURE q c
be replaced with
DECLARE theta REAL[1]
RX(theta) q
and some additional logic to only flip c if theta
is pi
(and not flip when it is 0
). The reason to leave it parametric is that during execution we can choose to either randomly symmetrize, or to exhaustively symmetrize (if it isn't too expensive).
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Related Issues (20)
- Possible a logical issue of qvm HOT 1
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