identity matrix

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i·den·ti·ty ma·trix

a square matrix in which the quantities on the diagnonal from top left to bottom right are all equal to 1 and all the other entries are 0.
References in periodicals archive ?
However, there exist three degenerate compatibility forms when some of the factors are identity matrices and not all of the factors have functional entries.
m - 1 are identity matrices of size [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
These gates are either tensor products of 2 x 2 unitary matrices with identity matrices (one-qubit operators) or tensors of 4 x 4 unitary matrices with identity matrices (two-qubit operators.