Template Class ObservableTNCudaOperator

• Defined in File ObservablesTNCudaOperator.hpp

Nested Relationships

Nested Types

• Struct ObservableTNCudaOperator::ObsKeyHasher

Class Documentation

template<class TensorNetT>
class ObservableTNCudaOperator

ObservableTNCudaOperator Class.

This class creates custatenetTensorNetwork from ObservablesTNCuda objects for measurement purpose. Since the NamedObs, HermitianObs, TensorProdObs and Hamiltionian objects can be encapsulated in a cutensornetNetworkOperator_t instance, only one ObservableTNCudaOperator class is designed here. Note that a cutensornetNetworkOperator_t object can only be created and destroyed by creating a new ObservableTNCudaOperator object, which ensures its lifetime is aligned with that of data associated to it.

Template Parameters

TensorNetT – tensor network class.

Public Types

using PrecisionT = typename TensorNetT::PrecisionT

using CFP_t = typename TensorNetT::CFP_t

using ComplexT = typename TensorNetT::ComplexT

using MetaDataT = std::tuple<std::string, std::vector<PrecisionT>, std::vector<ComplexT>>

using obs_key = std::tuple<std::string, std::vector<PrecisionT>, std::size_t>

Public Functions

inline ObservableTNCudaOperator(const TensorNetT &tensor_network, ObservableTNCuda<TensorNetT> &obs, const bool var_cal = false)

Construct a new ObservableTNCudaOperator object.

Parameters

• tensor_network – Tensor network object.

• obs – ObservableTNCuda object.

• var_cal – If true, calculate the variance of the observable.

inline ~ObservableTNCudaOperator()

inline auto getTNOperator() const -> cutensornetNetworkOperator_t

Get the cutensornetNetworkOperator_t object.

Returns

cutensornetNetworkOperator_t

api/classPennylane_1_1LightningTensor_1_1TNCuda_1_1Observables_1_1ObservableTNCudaOperator

 

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