Partial transpose of a tensor product expression

Assumes expr is a 2D square matrix representing a Kronecker product of length(dims) subsystems. Returns the partial transpose with the transpose applied to the subsystem at index axis (1-indexed).

Usage

partial_transpose(expr, dims, axis = 1L)

Arguments

expr

An Expression (2D square matrix)

dims

Integer vector of subsystem dimensions

axis

Integer (1-indexed) subsystem to transpose

Value

An Expression representing the partial transpose