entropyTwoSite()

SRDef syten::mutualInfo::entropyTwoSite	(	MPS::State &	input,
		Index	site1,
		Index	site2
	)

Calculates the two site entropy of a state.

Parameters

input	Input state.
site1	First site of the subsystem for which the entropy shall be calculated.
site2	Second site of the subsystem.

Returns

Entropy of the subsystem consisting of site1 and site2.

merge the upper and lower indices together

References syten::entropy(), syten::entropyOneSite(), syten::Basis::flipped(), syten::genFuse(), syten::genSplit(), syten::Tensor< rank >::getBasis(), syten::MPS::State::leftnorm(), syten::MPS::State::lIdx, syten::IdentityDenseTensorImpl::merge(), syten::MPS::State::rIdx, syten::MPS::State::rightnorm(), syten::MPS::State::size(), syten::sum(), std::swap(), and syten::MPS::State::uIdx.

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