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mpharrigan avatar mpharrigan commented on July 4, 2024 2
diff --git a/src/openfermion/circuits/gates/fermionic_simulation.py b/src/openfermion/circuits/gates/fermionic_simulation.py
index 3c03e11..0face4b 100644
--- a/src/openfermion/circuits/gates/fermionic_simulation.py
+++ b/src/openfermion/circuits/gates/fermionic_simulation.py
@@ -182,7 +182,7 @@ def sum_of_interaction_operator_gate_generators(
     return operator
 
 
-@cirq.value_equality(approximate=True)
+@cirq.value_equality(approximate=True, unhashable=True)
 class ParityPreservingFermionicGate(cirq.Gate, metaclass=abc.ABCMeta):
     r"""The Jordan-Wigner transform of $\exp(-i H)$ for a fermionic
     Hamiltonian $H$.

fixes

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mpharrigan avatar mpharrigan commented on July 4, 2024

Do you have any leads on what changed?

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fdmalone avatar fdmalone commented on July 4, 2024

Just looking at the release notes it's looks like there were some PRs related to EigenGate which this QFSG inherits from (e.g. quantumlib/Cirq#6231), not sure if related yet.

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mpharrigan avatar mpharrigan commented on July 4, 2024

I see quantumlib/Cirq#6275 and I see that the test is trying to make a shallow copy of the gate with __copy__. I would bet money that this is the source of the issue

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fdmalone avatar fdmalone commented on July 4, 2024

Fixed in #867

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