Criterion for Genuine Multipartite Entanglement Quantum Channels
Nian-Quan Jiang, Wangyu-Jian · Chinese Physics Letters · 2010
We introduce a character matrix for the N -qubit subsystem of a 2 N -qubit state and show the criterion for genuine entanglement channel existing between two N -qubit subsystems in the state. The criterion allows us to check conveniently whether genuine quantum channels exist or not in the 2 N -qubit state without calculating its N -qubit reduced density matrices.