build_exchange_mpo_above()

MPS::Operator syten::MPS::build_exchange_mpo_above	(	std::vector< Basis > const &	lop_basis,
		Index const	sa,
		Index const	sb,
		Basis const &	vac,
		std::vector< Pair< Index, Index > > const &	fermions
	)

Constructs a MPO acting from above which switches the two neighbouring sites sa and sb.

Parameters

lop_basis	vector of incoming physical bases onto which this MPO will act
sa	first site, to switch with sb
sb	second site, to switch with sa
vac	vacuum basis
fermions	vector of Fermionic symmetries and labels, a pair <s,l> specifies that a state with the 0-indexed l'th label of the 1-indexed s'th symmetry odd is fermionic.

Returns

a MPO which, when applied from above on a state with physical site bases lop_basis will switch the sites sa and sb. If fermions is correctly specified, the implied Fermionic ordering will be the same as the actual MPS chain ordering again after the switch.

References build_exchange_tensors_above(), genMPOId(), std::move(), std::vector< T >::size(), SYTEN_ASSERT, and SYTEN_ASSERT_MSG.

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