mps_mpo_ctr_ctr()

Tensor< 3 > syten::MPS::mps_mpo_ctr_ctr	(	Tensor< 3 > const &	left,
		Tensor< 3 > const &	right,
		Tensor< 3 > const &	lower,
		Tensor< 4 > const &	op
	)

Calculates a local site contraction.

Parameters

left	the left-contraction (to the left)
right	the right-contraction
lower	the ‘lower’ MPS component, not complex-conjugated
op	the local MPO component

Returns

the maximally possible contraction of the supplied arguments

Pictorially:

[      3]-           -[3       ]
[       ]       |     [        ]
[ left 1]---[  op  ]--[1 right ]
[       ]       |     [        ]
[      2]---[ lower]--[2       ]

For lower and op, the standard index ordering is in effect. The resulting MPS component also follows that index ordering.

References syten::MPS::Operator::dIdx, syten::MPS::Operator::lIdx, syten::MPS::State::lIdx, syten::MPS::State::lInt, syten::MPS::Operator::rIdx, syten::MPS::State::rIdx, syten::MPS::State::rInt, syten::MPS::Operator::uIdx, syten::MPS::State::uIdx, and syten::MPS::State::uInt.

Referenced by apply_op_orthogonalise_fit().

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