Fix for https://github.com/Qiskit/qiskit-aer/issues/2234

releasenotes/notes/probabilities-0137851da6c25572.yaml

@@ -0,0 +1,10 @@
+---
+prelude: >
+    Fixed a crash that occurred when using the MPS simulator, but possibly in
+    other simulators as well, in AERState::probabilities().
+fixes:
+  - |
+    The crash was generated by having op.qubits empty.
+    Refer to
+    `#2234 <https://github.com/Qiskit/qiskit-aer/issues/2234>` for more
+    information.

src/controllers/state_controller.hpp

@@ -1421,6 +1421,9 @@ std::vector<double> AerState::probabilities() {
   op.string_params.push_back("s");
   op.save_type = Operations::DataSubType::list;
 
+  for (uint_t i = 0; i < num_of_qubits_; ++i)
+    op.qubits.push_back(i);
+
   last_result_ = ExperimentResult();
   state_->apply_op(op, last_result_, rng_);