Stochastic local operations and classical communication (SLOCC) and local unitary operations (LU) classifications of n qubits via ranks and singular values of the spin-flipping matrices · arXivDesk
1805.01339May 3, 20187 pages, no figures
Stochastic local operations and classical communication (SLOCC) and local unitary operations (LU) classifications of n qubits via ranks and singular values of the spin-flipping matrices
We construct ℓ-spin-flipping matrices from the coefficient matrices of pure states of n qubits and show that the ℓ-spin-flipping matrices are congruent and unitary congruent whenever two pure states of n qubits are SLOCC and LU equivalent, respectively. The congruence implies the invariance of ranks of the ℓ-spin-flipping matrices under SLOCC and then permits a reduction of SLOCC classification of n qubits to calculation of ranks of the ℓ
Nearby in the stack
-spin-flipping matrices. The unitary congruence implies the invariance of singular values of the
ℓ
-spin-flipping matrices under LU and then permits a reduction of LU classification of n qubits to calculation of singular values of the
ℓ
-spin-flipping matrices. Furthermore, we show that the invariance of singular values of the
ℓ
-spin-flipping matrices
Ω1(n)
implies the invariance of the concurrence for even
n
qubits and the invariance of the n-tangle for odd
n
qubits. Thus, the concurrence and the n-tangle can be used for LU classification and computing the concurrence and the n-tangle only performs additions and multiplications of coefficients of states.