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PauliString repr does not preserve qubit order. #5564

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dabacon opened this issue Jun 21, 2022 · 1 comment · Fixed by #5565
Closed

PauliString repr does not preserve qubit order. #5564

dabacon opened this issue Jun 21, 2022 · 1 comment · Fixed by #5565
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area/gates area/paulis kind/bug-report Something doesn't seem to work.

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@dabacon
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dabacon commented Jun 21, 2022 •
edited by vtomole

Description of the issue

If you create a PauliString

p = cirq.PauliString({q2: cirq.Z, q1: cirq.Y, q0: cirq.X})

and round trip it via its repr, the qubit order does not match.

eval(repr(p)).qubits == p.qubits
>>> False

PauliString having ordered qubits was introduced in #4270
@dabacon dabacon added the kind/bug-report Something doesn't seem to work. label Jun 21, 2022
@dabacon dabacon mentioned this issue Jun 21, 2022
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@viathor viathor added triage/discuss Needs decision / discussion, bring these up during Cirq Cynque area/gates area/paulis labels Jun 22, 2022
@dabacon
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dabacon commented Jun 22, 2022

#5565 will fix this.

@tanujkhattar tanujkhattar removed the triage/discuss Needs decision / discussion, bring these up during Cirq Cynque label Jun 22, 2022
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Add qubits to PauliStringPhasor dabacon/Cirq
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@dabacon @MichaelBroughton @tanujkhattar @viathor