Method PMeasure

Core/QuantumMachine/OriginQVM.cpp:747–795

}

prob_tuple IdealQVM::PMeasure(QVec qubit_vector, int select_max)
{
	if (0 == qubit_vector.size())
	{
		QCERR("the size of qubit_vector is zero");
		throw invalid_argument("the size of qubit_vector is zero");
	}

	if (nullptr == _pGates)
	{
		QCERR("_pGates is null");
		throw qvm_attributes_error("_pGates is null");
	}
	try
	{
		Qnum vqubit;
		for (auto aiter = qubit_vector.begin(); aiter != qubit_vector.end(); ++aiter)
		{
			vqubit.push_back((*aiter)->getPhysicalQubitPtr()->getQubitAddr());
		}

		prob_tuple result_vec;

		prob_vec pmeasure_vector;
		_pGates->pMeasure(vqubit, pmeasure_vector);

		for (auto i = 0; i < pmeasure_vector.size(); ++i)
		{
			result_vec.emplace_back(make_pair(i, pmeasure_vector[i]));
		}
		sort(result_vec.begin(), result_vec.end(),
			[=](std::pair<size_t, double> a, std::pair<size_t, double> b) {return a.second > b.second; });

		if ((select_max == -1) || (pmeasure_vector.size() <= select_max))
		{
			return result_vec;
		}
		else
		{
			result_vec.erase(result_vec.begin() + select_max, result_vec.end());
			return result_vec;
		}
	}
	catch (const std::exception& e)
	{
		QCERR(e.what());
		throw result_get_fail(e.what());
	}
}

prob_vec IdealQVM::PMeasure_no_index(QVec qubit_vector)
{