document the endianness of the binary outcomes coming our of executor
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@beckykd is already working on this.
Since Sep 14, 2026.
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Description
Describe the fix or the content request.
Request from @SamFerracin
classical register 0 is 0th column of boolean array.
For a concrete example, in the absence of noise, the circuit
circuit = QuantumCircuit(3)
circuit.x(0)
circuit.measure_all()
is meant to return [True, False, False]. Sampler and Executor intentionally return outcomes in opposite order, and users should be aware of it.
this is mostly a matter of the order="big" default in BitArray.
https://quantum.cloud.ibm.com/docs/en/api/qiskit/qiskit.primitives.BitArray#to_bool_array
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