switch_sites()

void syten::MPS::switch_sites	(	MPS::Operator &	op,
		Index const	sa,
		Index const	sb,
		std::vector< Pair< Index, Index > > const &	fermions
	)

Given an MPO op, switches neighbouring sites sa and sb with fermionic sectors as specified by fermions where sa+1 == sb.

Parameters

[in,out]	op	in- and output MPO reference
[in]	sa	first site to exchange, has to be on the left of sb (sa < sb)
[in]	sb	second site to exchange, has to be on the right of sa (sb > sa)
	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.

References build_exchange_tensors_below(), syten::MPS::Operator::dIdx, mpo_cmp_prod(), syten::MPS::Operator::rIdx, and SYTEN_ASSERT_MSG.

Referenced by syten::MPS::SwappableTEBD::exponentiate_factor_mpo().

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