mps_mpo_mps_ctr_left()

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

Calculates a new left-contraction of an MPO with an MPS.

Parameters

left	the previous-left contractions.
lower	the ‘lower’ MPS component, not complex-conjugated
upper	the ‘upper’ MPS component, complex-conjugated
op	the local operator component

Returns

the new left-contraction

Pictorially:

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

upper, op and lower follow the standard index ordering.

Referenced by apply_op_orthogonalise_fit(), syten::MPS::TDVP::LBOWorker::calc_contrl(), syten::MPS::TDVP::Worker::calcContrL(), syten::MPS::ProjectedPurification::correlator(), and syten::MPS::ProjectedPurification::local_expectation().

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