Restrict controlled from non-thru registers #1305
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Left a comment on the original issue - #1304 (comment) |
This was referenced Aug 21, 2024
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Let's do this and relax later |
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| @attrs.frozen | ||
| class TestCtrlStatePrepAnd(Bloq): | ||
| """Decomposes into a Controlled-AND gate + int effects & targets where ctrl is active. | ||
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| Tensor contraction should give the output state vector corresponding to applying an | ||
| `And(and_ctrl)`; assuming all the control bits are active. | ||
| """ | ||
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| ctrl_spec: CtrlSpec | ||
| and_ctrl: Tuple[int, int] |
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Can we add a private flag to the Controlled class, something of the form _THRU_REGISTERS_ONLY = True, and keep this test around? Since we plan to relax this constraint later, it'll be nice to not delete the test.
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| @cached_property | ||
| def _thru_registers_only(self) -> bool: | ||
| for reg in self.subbloq.signature: | ||
| if reg.side != Side.THRU: | ||
| return False | ||
| return True |
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See other comment -- it'll be great if we can guard this with a flag set to TRUE by default. When we relax the condition, we can get rid of the flag and also keep the tests around.
tanujkhattar
approved these changes
Sep 10, 2024
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For #1304
Controlled