expectation() [1/2]

SDef syten::BTT::expectation	(	State const &	a,
		Operator const &	op,
		State const &	b
	)

Returns the expectation value of an operator between two states as \( \langle b | \left( \hat O | a \rangle \right) \).

Parameters

a	the first state, not complex conjugated, acted upon by \( \hat O \)
b	the second state, to be complex-conjugated
op	the operator

Returns

the scalar value \( \langle b | \left( \hat O | a \rangle \right) \)

References expectation_rec(), syten::genCombinator(), syten::genFuse(), syten::BTT::State::pleaseCache, and syten::BinaryTree::Tree< T >::r.

Referenced by syten::calc_expval(), expectation(), syten::Krylov::TensorNetworksImpl::HEffDenseExpectation::H_eff(), syten::Krylov::TensorNetworksImpl::HEffTridiagExpectation::H_eff(), and syten::BTT::State::load().

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