Template Class Observable¶
Defined in File Observables.hpp
Inheritance Relationships¶
Derived Types¶
public Pennylane::Observables::HamiltonianBase< StateVectorT >(Template Class HamiltonianBase)public Pennylane::Observables::HermitianObsBase< StateVectorT >(Template Class HermitianObsBase)public Pennylane::Observables::NamedObsBase< StateVectorT >(Template Class NamedObsBase)public Pennylane::Observables::SparseHamiltonianBase< StateVectorT >(Template Class SparseHamiltonianBase)public Pennylane::Observables::TensorProdObsBase< StateVectorT >(Template Class TensorProdObsBase)
Class Documentation¶
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template<class StateVectorT>
class Observable¶ A base class (CRTP) for all observable classes.
We note that all subclasses must be immutable (does not provide any setter).
- Template Parameters
StateVectorT – State vector class.
Subclassed by Pennylane::Observables::HamiltonianBase< StateVectorT >, Pennylane::Observables::HermitianObsBase< StateVectorT >, Pennylane::Observables::NamedObsBase< StateVectorT >, Pennylane::Observables::SparseHamiltonianBase< StateVectorT >, Pennylane::Observables::TensorProdObsBase< StateVectorT >
Public Types
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using PrecisionT = typename StateVectorT::PrecisionT¶
Public Functions
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virtual ~Observable() = default¶
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virtual void applyInPlace(StateVectorT &sv) const = 0¶
Apply the observable to the given statevector in place.
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virtual void applyInPlaceShots(StateVectorT &sv, std::vector<std::vector<PrecisionT>> &eigenValues, std::vector<std::size_t> &ob_wires) const = 0¶
Apply unitaries of an observable to the given statevector in place.
- Parameters
sv – Reference to StateVector object.
eigenValues – Eigenvalues of an observable.
ob_wires – Reference to a std::vector object which stores wires of the observable.
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virtual auto getObsName() const -> std::string = 0¶
Get the name of the observable.
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virtual auto getWires() const -> std::vector<std::size_t> = 0¶
Get the wires the observable applies to.
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inline virtual auto getObs() const -> std::vector<std::shared_ptr<Observable<StateVectorT>>>¶
Get the observable data.
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inline virtual auto getCoeffs() const -> std::vector<PrecisionT>¶
Get the coefficients of a Hamiltonian observable.
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inline auto operator==(const Observable<StateVectorT> &other) const -> bool¶
Test whether this object is equal to another object.
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inline auto operator!=(const Observable<StateVectorT> &other) const -> bool¶
Test whether this object is different from another object.
Protected Functions
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Observable() = default¶
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Observable(const Observable&) = default¶
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Observable(Observable&&) noexcept = default¶
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Observable &operator=(const Observable&) = default¶
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Observable &operator=(Observable&&) noexcept = default¶