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Fix loose-bit handling in QPY (Qiskit#8928)
A typo in clbit-reconstruction was generating the incorrect number of loose clbits in circuits that contained registers and loose bits, and had more qubits than clbits. A bug elsewhere in the code caused circuits with _no_ registers to be deserialised as containing registers, since the `QuantumCircuit(int, int)` constructor actually does produce two registers (slightly surprisingly, perhaps).
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,9 @@ | ||
--- | ||
fixes: | ||
- | | ||
QPY deserialisation will no longer add extra :class:`.Clbit` instances to the | ||
circuit if there are both loose :class:`.Clbit`\ s in the circuit and more | ||
:class:`.Qubit`\ s than :class:`.Clbit`\ s. | ||
- | | ||
QPY deserialisation will no longer add registers named `q` and `c` if the | ||
input circuit contained only loose bits. |
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