seemps.state.CanonicalMPS.extend

method

CanonicalMPS.extend(L, sites=None, dimensions=2, state=None)

Enlarge an MPS so that it lives in a Hilbert space with L sites.

Parameters:

Lint

The new size of the MPS. Must be strictly larger than self.size.

sitesIterable[int], optional

Sequence of integers describing the sites that occupied by the tensors in this state.

dimensionsUnion[int, list[int]], default = 2

Dimension of the added sites. It can be the same integer or a list of integers with the same length as sites.

Returns:

MPS

The extended MPS.

Examples

>>> import seemps.state
>>> mps = seemps.state.random(2, 10)
>>> mps.physical_dimensions()
[2, 2, 2, 2, 2, 2, 2, 2, 2, 2]
>>> mps = mps.extend(12, [0, 2, 4, 5, 6, 7, 8, 9, 10, 11], 3)
>>> mps.physical_dimensions()
[2, 3, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2]