expectation() [3/5]

SDef syten::MPS::expectation	(	State &&	a,
		Operator const &	op,
		State &&	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 to be complex conjugated.
b	the second state, to be complex conjugated
op	the operator

Returns

the expectation value of \(\hat O\).

Remarks

Destroys the supplied state to avoid useless re-caching.

References syten::MPS::Operator::dIdx, syten::genCombinator(), syten::genFuse(), syten::genSplit(), syten::MPS::Operator::lIdx, syten::MPS::State::lIdx, syten::MPS::Operator::rIdx, syten::MPS::State::rIdx, syten::split(), SYTEN_ASSERT, syten::transpose_exchange(), syten::MPS::Operator::uIdx, and syten::MPS::State::uIdx.

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