Updated QAOA circuit runtime arguments

First argument is the qreg.
Signed-off-by: Nguyen, Thien <nguyentm@ornl.gov>

quantum/plugins/algorithms/qaoa/qaoa_circuit.cpp

@@ -165,11 +165,11 @@ std::shared_ptr<CompositeInstruction> QAOA::constructParameterizedKernel() const
 void QAOA::applyRuntimeArguments() 
 {
   // Apply runtime arguments: i.e. resolve all parameters to concrete values
-  m_nbQubits = arguments[0]->runtimeValue.get<int>(INTERNAL_ARGUMENT_VALUE_KEY);
-  const std::vector<double> betaVec = arguments[1]->runtimeValue.get<std::vector<double>>(INTERNAL_ARGUMENT_VALUE_KEY);
-  const std::vector<double> gammaVec = arguments[2]->runtimeValue.get<std::vector<double>>(INTERNAL_ARGUMENT_VALUE_KEY);
-  auto costHam = arguments[3]->runtimeValue.getPointerLike<xacc::Observable>(INTERNAL_ARGUMENT_VALUE_KEY);
-  auto refHam = arguments[4]->runtimeValue.getPointerLike<xacc::Observable>(INTERNAL_ARGUMENT_VALUE_KEY);
+  m_nbQubits = arguments[1]->runtimeValue.get<int>(INTERNAL_ARGUMENT_VALUE_KEY);
+  const std::vector<double> betaVec = arguments[2]->runtimeValue.get<std::vector<double>>(INTERNAL_ARGUMENT_VALUE_KEY);
+  const std::vector<double> gammaVec = arguments[3]->runtimeValue.get<std::vector<double>>(INTERNAL_ARGUMENT_VALUE_KEY);
+  auto costHam = arguments[4]->runtimeValue.getPointerLike<xacc::Observable>(INTERNAL_ARGUMENT_VALUE_KEY);
+  auto refHam = arguments[5]->runtimeValue.getPointerLike<xacc::Observable>(INTERNAL_ARGUMENT_VALUE_KEY);
   // Number of QAOA steps
   m_nbSteps = betaVec.size()/m_nbQubits;
   parseObservables(costHam, refHam);  

quantum/plugins/algorithms/qaoa/qaoa_circuit.hpp

@@ -22,6 +22,7 @@ class QAOA : public xacc::quantum::Circuit {
 public:
     QAOA() : Circuit("qaoa") { 
         // Runtime arguments
+        arguments.push_back(std::make_shared<xacc::CompositeArgument>("qReg", "qreg"));
         arguments.push_back(std::make_shared<xacc::CompositeArgument>("nbQubits", "int"));
         arguments.push_back(std::make_shared<xacc::CompositeArgument>("gamma", "std::vector<double>"));
         arguments.push_back(std::make_shared<xacc::CompositeArgument>("beta", "std::vector<double>"));