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cphase comparison with CZ failing after dependency update #6663

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NoureldinYosri opened this issue Jul 10, 2024 · 1 comment · Fixed by #6669
Closed

cphase comparison with CZ failing after dependency update #6663

NoureldinYosri opened this issue Jul 10, 2024 · 1 comment · Fixed by #6669
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kind/bug-report Something doesn't seem to work. triage/accepted there is consensus amongst maintainers that this is a real bug or a reasonable feature to add

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@NoureldinYosri
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Description of the issue
test following test case started failing at HEAD when run with the latest dependency versions

Cirq/cirq-core/cirq/ops/common_gates_test.py

Lines 902 to 904 in 32d4833

def test_parameterized_cphase():
assert cirq.cphase(sympy.pi) == cirq.CZ
assert cirq.cphase(sympy.pi / 2) == cirq.CZ**0.5

I temporarly added annotated it with xfail until we fix it.
@NoureldinYosri NoureldinYosri added kind/bug-report Something doesn't seem to work. triage/discuss Needs decision / discussion, bring these up during Cirq Cynque labels Jul 10, 2024
@NoureldinYosri NoureldinYosri mentioned this issue Jul 10, 2024
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@dstrain115
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dstrain115 commented Jul 17, 2024 •
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cirq cync: Comparison sympy.pi now no longer equals math.pi. Solution is unclear.
We could add a float() conversion, but this seems to defeat the purpose of the test.
(Possible solution: check equality against sympy.pi)

@dstrain115 dstrain115 added triage/accepted there is consensus amongst maintainers that this is a real bug or a reasonable feature to add and removed triage/discuss Needs decision / discussion, bring these up during Cirq Cynque labels Jul 17, 2024
pavoljuhas added a commit to pavoljuhas/Cirq that referenced this issue Jul 19, 2024
@pavoljuhas
Fix equality for cphase gate initialized with sympy constant
5a24661 
Problem: In sympy-1.13.0 the `sympy.S.One == 1.0` and
`sympy.S.Half == 0.5` expressions evaluate to False which causes
inequality between `cirq.cphase(sympy.pi)` and `cirq.CZ`.

Solution: Check equality with parametrized exponents converted to float.

Fixes: quantumlib#6663
@pavoljuhas pavoljuhas mentioned this issue Jul 19, 2024
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Fix equality of cphase gates initialized from sympy constants pavoljuhas/Cirq
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@NoureldinYosri @dstrain115